Malicious PDF — malware analysis report

Static analysis result for SHA-256 88091023fb7a08f5…

MALICIOUS

PDF

123.5 KB Created: 2021-09-05 23:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47e39fe099dc1c703c9ad319f9a19219 SHA-1: 1e7ef7c2a5e04b583357a607330e619d3bad02ba SHA-256: 88091023fb7a08f5cf4be86faeb52674d42f7a324dd3e6c26c4554b029b945b0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vmkmsz.hu/userfiles/file/83149533669.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4286c20d850135239ad9f9d105f5fee1/61600094903.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862a0d8e030---jobawafalida.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c1942d5d---4702528974.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608681a56835b---43737533181.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/66625137709.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b800a191bf4---sowenibifage.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fece6cf797---guwetifasipepezakis.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609258de34674---rojerixoxaxibase.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fef2185aa---36206993139.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/59073122984.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/xofode.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/73d23fc6dcc95512f951e580290ef9d0/vudubivawawisokunaru.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vutanulabo.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/4867283878db28814a4da6ed1d824fb8/87222726125.pdfIn PDF document text
    • http://snsi.jp/image/news_file/95566289241.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/88551583360.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607930acec395---15791719818.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/sajuzafesaxepexib.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/bonawipezizireradamavu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2126eac1ab---93522011339.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/fimafetozod.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ca9e60adf---morusotijosuzu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a39bb53d3d3---kinofopabek.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0eiqr4qtd51f5genhpto6mi912/35204200105.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/71ofq9ulep8v78nvprlqm7rek3/25469482563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=razor+pocket+rocket+owners+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15814 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off00016d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D9F 24588 bytes
SHA-256: b3f5709ba0122093f1512c3f3700ff906cd7697ea4721982214fdcc4de3a9c5f
font_02_sfnt_off0001ae2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE2B 10828 bytes
SHA-256: bfde4eb2ca08340482bc1f92173329894162d3b6eca5507d975d88ea3a62479a
font_03_sfnt_off0001c754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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