Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d69a0a66dd4af6…

MALICIOUS

PDF

98.3 KB Created: 2021-07-03 02:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da9ee8635ffcf21acfcda4d93b4145b0 SHA-1: 0e231f3c286f130c3eb385c0410533f1fb4ec401 SHA-256: 12d69a0a66dd4af6a8e3fd413e36f5f96f1d3b9e6714e0942dbaa134e3ea8174
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b357b02d626f986389650840752b1bda/24242767284.pdf
    • http://aisef.org/uploads/userfiles/file/file/kojujitagomuvegazu.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095aa65a5303---40259290134.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/5m97g25e997i6vq403v2oblqmc/17578414178.pdf
    • https://qqhanoman.com/contents//files/3080511227.pdf
    • http://architettoangeli.it/userfiles/files/winivoxasolilibexazudob.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096d02889c84---61504397278.pdf
    • http://melinterior.ru/userfiles/files/11769127893.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5fa59cc36c9d46a15c77125a81148ebb/72091091084.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abba29c1a2a---salijolukanipex.pdf
    • http://thanhnhomdinhhinh.net/uploads/files/75156784285.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b32b2fe8ed2---88657074799.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad90045da---16524681079.pdf
    • http://kstarsmall.net/userfiles/file///94162229676.pdf
    • http://teresachild.com/upload/files/76856037937.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160830a9755293---wiwanexigalilogilugenaf.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ed22e4b621565b6f70fa1303a989975b/92967144078.pdf
    • http://bocghedanang.com/media/ftp/file/55338565428.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/2b8de5af74c8c5fb0c29d5265232af15/37082481976.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3766d054bfe340397c21f233df0b8224/76294096882.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7a9509c5---44193658434.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/7oe01mg8ojt6lgi6ceudv7tmk1/74929012160.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609504bdd171a---pimomufaleresib.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f72d454c52604ffcf95e30162f08df43/61310358185.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d5fd7ad0ac4cc342cb8bdaa9a0ea2964/mugiwu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=latex+data+science+resume+template
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d03.bin
510b3944eae3b3dd92d2a676befd68906e5fe338bd0f84d70a9049b9a7bb940a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 10712 bytes
font_01_sfnt_off0001358f.bin
dc45d76e47d55d0dd7702a40a0073be17460135d9eedda8cfb0d600bdc730cf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1358F 17816 bytes
font_02_sfnt_off000163dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x163DC 16792 bytes