Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9246b86a7894e1…

MALICIOUS

PDF

86.8 KB Created: 2021-07-21 01:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a06b278864a8af41e67a54ba2a9d4b3f SHA-1: 83d2686e91e984ffcb6102911d2c7091bd52b735 SHA-256: 6c9246b86a7894e129497d1f4ddb811efa87f9819f7818edfa89678c9f487dc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress installations used for hosting PDF files. This suggests the document is part of a phishing campaign, likely intended to lure users into downloading further malicious content or visiting fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://backupcenters.com/userfiles/file/17946415660.pdf In PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/dadimekuwajoki.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/63479783633.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/353f1805ed1287ef33e4428b47d770aa/72182911895.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/67032101847.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/sq0f1jr955e0qvdtdr0e4oc7e6/17138523239.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/mizakajagobivebekofin.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/mogokevuzipimud.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/2oubl7t07l2137on8al0rdrbb4/sebati.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc98c7586c---46676664733.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/id4cc77ue7n7jd2deh48f5dbbe/89736105668.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e80a0d62ee---zururu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f52c448af0608c509b65d5fe24b90dbe/lejawe.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/p2et6vhdvu3uuvu3kalagl6o0d/60195768863.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9a3def590a594a22d848e723e60a7de3/solasalapobutobufuwexisub.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/eapsc4727ca07sq7cf8st1u2l8/nabeb.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160794f9b6aa45---siloxifotazubotifix.pdfIn PDF document text
    • http://thedreams.cz/files/pojukitutigivekaduvu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac30924ba9e---remuginolu.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/39530232742.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076421bbacbe---totajuberozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=i+feel+guilty+after+eating+anythingPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 17524 bytes
SHA-256: e8477f4113177df6ad710622495a19acd3cd819b543fa55ee5a8d73a89f2562b
font_01_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13712 10368 bytes
SHA-256: e2444bface6a491a349fb241afa970bdc7cb23469ea82a75f306a42852d4b782

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