Malicious PDF — malware analysis report

Static analysis result for SHA-256 e777e9575aba4e7f…

MALICIOUS

PDF

95.5 KB Created: 2021-07-31 23:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d54b45547c1cebbd3fce8137540197ab SHA-1: 5a1bf9dedfd6bf915f38ce9bf047c5b316d7e596 SHA-256: e777e9575aba4e7f365bf98c0d5c6d9fba5adbafac4347b02cceaaaa0be4038a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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 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://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/l9kgmnegtag0p8js5c6v2sdt1b/45066964421.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/uhb8echiducqs6732248aokt3q/17288522885.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/6rs7t8bgjrqgrkg6dcof7ud0n0/gezugisiwisopilojukux.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/juwusivibe.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1e0c30a5fc28469c22dee6456a39e588/26818945571.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160795d35f418e---peripirasuzam.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/mafuxinekujijar.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e175a51898d62f601ae95d7b05d2ddec/nakapokegoguj.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d863f495---37788938854.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/406m1csrkc84smsl6f4nsaqao5/3588121297.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f7a50760---7199851722.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/vufajobano.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/75iiudcmkqtvafiahgk86tlu8v/22147961859.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/tucie70d3v8fpvl86gfacfmfv5/44982188133.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/57599486054.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5653d5b851---fatoritabusoneropamonuxon.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/reluziridegawebazal.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b96d96c17---44873862513.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/kasivebobopava.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4a6091ab712e254e105582844a967aef/46696058828.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/19013073240.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/pufagexixesilagemarepim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+many+pounds+of+feed+per+pig+per+dayPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b748952f1---93181272352.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_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 10988 bytes
SHA-256: 71963105c329b01c03b5f1a79f02d7d8080a52a7371418f4ca13c325129a2d39
font_02_sfnt_off00013fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD8 17584 bytes
SHA-256: 2fe5af30c7a544c90cd9632093b6b35190f6d1635a0c7e5a0e1b2b3c6ad22a94

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