Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abc9a1638a6eabd…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 12:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f36d7ff5ae7c3233e5f4bbf74bf6f3e6 SHA-1: 7160496485390093a868cdaaeb8e1eceeedc15a5 SHA-256: 1abc9a1638a6eabd077e6fee425b75e06eba3605b754ecf6835db02b1140dbdf
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It employs a 'password-protected archive lure' heuristic, suggesting it intends to trick users into believing they need a password to access an archive, likely to bypass security scanning. The document also contains numerous links to potentially compromised websites, indicating a link farm or SEO poisoning tactic to distribute further malicious content. No scripts were extracted, but the overall pattern suggests a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vicotelecom.vn/static/source/images/file/rirufivuxinani.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ecab934fd5---47328877643.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/39422988825.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/folunizaxojidazajejabimu.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/70334486311.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/51340452163.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d847c26f---jipizi.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/26594300602.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u2ddqejlubelp4flprrce0qe77/78571496230.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/kanefexerunujew.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f40dc27a7---jusara.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138304c2858a---rebusujew.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/mepipafumotodijifabaxodu.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/vijipo.pdfIn PDF document text
    • https://protum.se/file/dodakunijotuxuzorelalid.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/53278159227.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/78246769262.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/87612262348.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/73100896561.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/vetufuzedusujuronilufeba.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/pewanadafa.pdfIn PDF document text
    • http://agilesolutions.in/uploads/78670770718.pdfIn PDF document text
    • http://aven.su/userfiles/file/63391966384.pdfIn PDF document text
    • http://glttek.com/userfiles/file/dajusobajowezozabu.pdfIn PDF document text
    • https://0900107678.com/upload/file/lisepabifuputanizo.pdfIn PDF document text
    • http://www.fotolia.com'&gtIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+convert+zip+file+to+mp3+on+android+phonePDF link annotation
    • http://www.fotolia.comIn 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_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 17676 bytes
SHA-256: fc9527a7562268c8ea08d3692f19539aff646c2bcb934924e5143ad8d906521d
font_02_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 11092 bytes
SHA-256: 7570798b45d33a10a8b26b3c1f5012d08b9cf65d31807968abd25d423dd10be4

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