Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7adbcd1e1adaf21…

MALICIOUS

PDF

90.5 KB Created: 2021-08-01 19:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92a587507059ee4eeff22a85fea4f4ab SHA-1: d56bb2f9c64f0ea780817f30f920501aba9e760f SHA-256: a7adbcd1e1adaf2118a54d6f070bda356f313b5ff443200d3b2ae6cdd65ba67c
176 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. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories, and exhibits characteristics of a link farm designed to redirect users to potentially malicious sites. The presence of callback phishing lures suggests an attempt to trick users into contacting threat actors for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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) 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 https://pistant.ru/uplcv?utm_term=monthly+income+limit+for+food+stamps+in+illinois PDF link annotation
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd2d528d4b---zijumew.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4a8af8f94116887c8abfd87673cfe323/69036292884.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/murilimu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160766eb1ac146---48812368447.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/86129232223.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c5c31cf70---dedemitawexavawakefiv.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/punegixisunilola.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/79ft9os52svhce27rbh2rj3mi5/52599403416.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/3508832664.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/94888412c082a394906ed75203bb783f/9011679701.pdfIn PDF document text
    • http://waterreducer.cn/d/files/sabavorurofapa.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/70408560388.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/edegasejapenedonumel.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5c84ab4fc4ded08736a2fcd20fa64514/lazabigapikofujakam.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/zenuwavegatoxisikunaz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0s68d817fg5kadomk7bkfa6cb6/zewurabevew.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/japozitebewitite.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/87134426933.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d0e8022b0---29189967163.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e89768f934ea22e07cf29dce72d86033/80411012846.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa87da08615---xewogisepomit.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f764e6408---65244567562.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/99f285729bd95b3c55608b49ee643169/39592751332.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbb08168f---2090035587.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_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 10992 bytes
SHA-256: 91de00230b22f0c53a89406ec64e8b546b6af34f2674752f107ddf9b121ac4cf
font_02_sfnt_off00012e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E72 17372 bytes
SHA-256: 02607e35d1c89e91b65b3b11f84983a0bc60b7bcd8751d90c4ab1ea13ebf1420

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