Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d27aeb4c17dc9d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 22:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5de7bec25a210255426ed5b13ac86c8f SHA-1: ac94cd9703aeba6e4a2edc09dca29a37e7475f16 SHA-256: 82d27aeb4c17dc9d7d164fbea8466b0610965abe57aa314ce7117b1cfffa09aa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains multiple links to external sites, some of which are hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to make a phone call, consistent with phishing or scam tactics. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=online+random+live+video+call PDF link annotation
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e004a3585---4974171511.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/69781382249.pdfIn PDF document text
    • http://qzgj.cn/upload/file/14852731198.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/nogesewamabarazo.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/48839655522.pdfIn PDF document text
    • http://wdnederland.nl/file/lefafadibidakiturononaj.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/likoma.pdfIn PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/53804456575.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/3172262596.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/xefarekapuperebivijumixev.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/96715689806.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/82822057966.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/33945281869.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/12790911024.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/80510508632.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140433dad8e3---44671615206.pdfIn PDF document text
    • http://4rrecycle.com/files/file/petudijekuliduro.pdfIn PDF document text
    • https://geloracinta.com/contents/files/wosuxawujed.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161409bb504bb0---pimaxexupigedofojedutaku.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161322a8781b27---tiwanijagaz.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/xuserez.pdfIn PDF document text
    • http://anm-av.de/uploads/files/redumakakovepozup.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/sijiwodolekoretowegumosi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/drke1f2dj0g5bc61c0gbqqmeq3/jadakifu.pdfIn PDF document text
    • http://etkenkalip.com/files/penuzukoxajewubeparo.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_off0000cfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 10356 bytes
SHA-256: 8abe44705c28223929cfb8f276367b245e0f880efdadff1926f178ab18069c6a
font_02_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 17248 bytes
SHA-256: f35d00445061a5782d4e5d3af90c52783684c1f89731974cf0724a7370f286b4

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