Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f5f49d725976d9…

MALICIOUS

PDF

90.8 KB Created: 2021-07-22 09:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2fae44b6d9f4442f57fe0f26436cb324 SHA-1: ca5d5bef760ad8b9f4297e623769c7d2f47346e0 SHA-256: 73f5f49d725976d99e0839c31a9de97ab85efff4839d62a5834052811797fe90
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates a pattern consistent with callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://www.verneteco.com/ckfinder/userfiles/files/baxofizemanawadobova.pdf In PDF document text
    • http://udmvdpo.ru/images/files/kodaruxanexopurezigozen.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/80847514808.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/48962005080.pdfIn PDF document text
    • http://redactron.com/userfiles/file/denawigexukalus.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/56329980018.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/819442bfff00c397ecd37af1827f8326/pomusemebozoxi.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3dc008ca9d9c8f112388a05e7de95e37/bofolofiraxapekozotem.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc42e1c7cb---26607661975.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e1a21d8ab34c737a420eabda54a0d3c8/leruv.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93d70cf463---vejerasan.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b980508becc---murozofapexedetaxu.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/dukovufuwe.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/52819565769.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a5306d79d---zadik.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780337005fd---79152044234.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/2329754577.pdfIn PDF document text
    • http://fiscalonline.eu/app/webroot/files/userfiles/files/46759868389.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f6f7c50decef2adb2e1f4861b0dca24a/27951739132.pdfIn PDF document text
    • https://cakkue.com/contents//files/menasufoli.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/e867e3ec541bb4b6cd0339e9374e7fe9/sijolipot.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/fafogijosaxutaduso.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/fb4fff1ea7a54c6b425f6e38a2ec62b8/lolej.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/1701505212faac32fe3e434ab6df30af/tesofosazezova.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/62235439446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=first+satellite+launched+in+spacePDF 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_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 10568 bytes
SHA-256: 3ae54d8143825120c1addc4ea40e7a93512253f8b0aa82273c0a84dea8b64f00
font_01_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E24 17576 bytes
SHA-256: 4650e870b32f560fed6c2694d228652ad0b42399bbd0e3bf8b83ba8e176f86fa