Malicious PDF — malware analysis report

Static analysis result for SHA-256 7990b4c863d89bf3…

MALICIOUS

PDF

80.0 KB Created: 2021-06-10 09:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddbe796a562018d4135d737915d3fd34 SHA-1: 449f51f7f451db5b52f9eb9472aef2b2ee616be5 SHA-256: 7990b4c863d89bf309a29414f9079a9141797ac879677959ae0423b56c9525b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially deceptive content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=monheim%2527s+local+anesthesia+and+pain+control+in+dental+practice+pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca366aaed2---48315109278.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/8f77d9c83d744762104ab84cd5550982/rujufo.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b9afbdbbd3fcdb7ad969f5c0484c1642/4605364148.pdf
    • https://coevent.ru/upload/files/92619619144.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a1042339a4be06416de6c69ada0a4852/17757133983.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/85f6ec48b7455aa4f25b7e8365832f38/bipitarevajibusaxokup.pdf
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/dozutozoza.pdf
    • http://www.asslar.de/downloads/dakapeso.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d447e07b8121e6eafcbc0bc2c718394b/ralotixerepope.pdf
    • http://tourister.kr/userfiles/file/tipobujude.pdf
    • https://ooo-kenk.ru/userfiles/file/16997340694.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/kutigidugunakapunipadise.pdf
    • http://nessium.fr/userfiles/file/56569857067.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9c.bin
24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 6588 bytes
font_01_sfnt_off0000e016.bin
ed1725966fb5db8381302eb5e1a499524d94cf589b95eae769735930c5ca0d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5432 bytes
font_02_sfnt_off0000f277.bin
2fae5aba59d248f2291f0a5a2a8644f86c47b4c73acb26e7e4c9360881b8f8f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 11820 bytes
font_03_sfnt_off00011a22.bin
7e0863d6dcdfe3ce59f67395a06e5e8634226e44f713773c85e494ff6d119ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 16344 bytes

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