Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1cea416f9f86bc…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 08:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7fa09f11ef6d0d6f7ac0115658bbf65 SHA-1: 15480ab0f17726d211b4b6f50f34d5cf35b0d4f8 SHA-256: 8d1cea416f9f86bc5e431a50c70682505b2ce949d64a3476cc450d54ba6025db
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://huntic.ru/uplcv?utm_term=tiktok+logo+emoji+copy+and+paste PDF link annotation
    • https://internationallanguagenavigators.com/media/vejamogifofogajanapif.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/xinapuseminejiramugaxiza.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/7347132850.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/1749921242.pdfIn PDF document text
    • https://krusomying.com/data/file/xozexep.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/dipawirero.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161457d5b25788---tewekatalekewusebaga.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396e22777b4---tifajo.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/pukine.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/6950912988.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b259027565---78454339720.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613032255a663---74206541785.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/tiwupudenarafegudopetibaw.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/judafe.pdfIn PDF document text
    • http://schokofontaene.de/idata/23120383974.pdfIn PDF document text
    • http://shopabrang.com/images/files/nesitijujamejuxavifita.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/ruzulofuvuv.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/rijufovagutaganivaz.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/kinitibijuxugebenopababi.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/92541233278.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 11056 bytes
SHA-256: 6eabd0c8a0d420b196442a98d15b6ca613a7078fb22ba20207c002272970f1f9
font_02_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 21232 bytes
SHA-256: 6ecfae87b91e1b99682f98793016a5f8d9ef3a3d8b73f2d33ae9ddf57d9d2ac7

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