Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a961b4f6723c5f…

MALICIOUS

PDF

90.4 KB Created: 2021-08-08 20:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94c22aa2c55d7d654d9ded6bb4045b2a SHA-1: f41e54d544e746b52f42ac5462e670889cd2783f SHA-256: 41a961b4f6723c5fddba81038803332ff8f894ae464c2b2e9c83c94ef8ab94b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to websites hosted on compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further payload delivery. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://mariellatriolo.it/public/file/raxamezovujurexafazo.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed36c89659b---leditewe.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/jaravurozigaxikeromijuf.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/juligewejamizesarix.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/97197697706.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/59170576616.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791c89d919e---5226148510.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6657c3e4---mimamovogadip.pdfIn PDF document text
    • http://ktcz.eu/files/files/59421927582.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106381935d8e---zitetesogop.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a563062a0---jiwepurinuvizire.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/16393953423.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/dinev.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd46ca2c20---keroxijajiresegofawen.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/19135618173.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608826af2a83f---39141812210.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/woruvobexoxos.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/34514962542.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad03de4537b---20208453254.pdfIn PDF document text
    • https://elektrona.cz/files/file/xerisekopuvovibonofipujog.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-11/20210611000405493131.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608123e536097---41585903382.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/rujokaxisogipanukisaguw.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/81563983528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bissell+proheat+perfect+pass+manualPDF link annotation
    • 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_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 16464 bytes
SHA-256: 60dc242ae4e6454e37575164664fd181fe8939ba0908822b226ac2a8d2b57bc0
font_01_sfnt_off00012a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14299 10900 bytes
SHA-256: ff8545e3508fef0a2283c6e5fa6fd2162d5afd92fb38da998fe8b15245baca8a

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