Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be6943010ac4470…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 23:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 943cadd3c36bc32ef2ce2852d4cdaf4f SHA-1: 86320d0fd6c68294d8529d22cf45fed1e9c3d0db SHA-256: 0be6943010ac44702c7f86cd1118a6b4bdd2c5133b1457f8afe5b49a540fea2d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of numerous external links, including those pointing to potentially malicious content, suggests an attempt to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=agricultura+de+subsistencia+em+mocambique+pdf PDF link annotation
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c48a051e---dexekurexaxoge.pdfIn PDF document text
    • https://zold-kommando.hu/files/tevedagafarovoki.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613057b971651---zewalezamu.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/lubokepaxowijemaru.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/kabenitugedafirubogoke.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/9578012665.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/sijixebededo.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/71761577446.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/wezijafatoj.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210516183706.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/dizefuvunuxiwifam.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/49dfc7da34c596564acd9ecfeecd60e1/lizaxovowegijinaxaxujo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/96686ba198f238bebbe0864b13c5c7db/zuzulewogipufizefu.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/df179ffb130d7e9a9fbad7efccea7ba1/voromawavadozisebeve.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d4f9fda1---9429842867.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/sbindeimb3td1sp148lttgdc6v/11992391265.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4261ec07e1ab6886b60412cd253297d2/dobasu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079ffa3a81b8---xatufuxamugetagofunivu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a90a6fcc---ripexekegufodifebe.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h2t475tatf7piu8m4pblkqc1t1/melaxenudivanugero.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/64078926308.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074d89489187---18257714944.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f2c5b0f20---kewukaruwogox.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_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 20148 bytes
SHA-256: 81ec5e382fd367b91df52068fa6fbeb7ca45dfe738904dcddbe913e548a19709
font_02_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 11328 bytes
SHA-256: be2c2b95e3d3625ebdb47095e49f6772fbba98e6e464b6c6a38610935617c0d6

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