Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f3ef6488ec8c0c…

MALICIOUS

PDF

92.4 KB Created: 2021-08-30 11:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef9dffe5ac46c55689dc62fc20152b42 SHA-1: 217210a41b3e56166ffce6ee68a5f31b002bcb01 SHA-256: b0f3ef6488ec8c0c7ac6d7ac50939b351b502696e3e59981369522b7b80b5a64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress installations. These URLs are likely used to distribute further malicious content or to engage in SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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 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://philabc.ru/uplcv?utm_term=family+nudist+camp+stories PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095aaef47693---jokiraradonamerikipi.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/povodaxelojana.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/vekiviwuvobamirufejamun.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/27319663465.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/68348970333.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107100858062352.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/r6npopl79bjf4gmiddp38iidvp/pulogunotazevuw.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/90424733461.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108f5cf83a68---85356110229.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/36836573504.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611f065f75faa---18479068783.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/43274040656.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2062a9f69---vonapajoxekijefi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c0aa3bde---jetilusuxowuxomav.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/xidewizowizuj.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a8c359c3201f8245145d9d5f0f11bd5b/2651310249.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9607g9cp63793pfp9eh4fi8i67/meverifok.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/fulesowik.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/dexuwotesojig.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/96195054086.pdfIn PDF document text
    • http://castel.lu/userfiles/files/59383070272.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24f6c0282---43916180206.pdfIn PDF document text
    • https://razredna-nastava.net/files/xogovumetuwobusuremut.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_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 10868 bytes
SHA-256: 9bec7307539b2251f6a8451a5c04fb9a7fbe85bc29ba278106963c87959e21a4
font_02_sfnt_off0001371c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371C 16896 bytes
SHA-256: 3914fb74e14c95a4c960e7d5d4589ce5acf1f28372785e78a63ebb2fbb0052cb

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