Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a7e3a8cfeff5d8…

MALICIOUS

PDF

72.1 KB Created: 2021-09-15 09:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85e1cc020d25e14d28f3cb8772a160ec SHA-1: 4ce119ec2654e141d7d02b4ee76a90fe64f05e74 SHA-256: 61a7e3a8cfeff5d846e34a8c4663d36e5b41a22d49d91a8d7b398122881a65b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads. This pattern suggests the document is designed to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=stative+verbs+exercises+pdf+with+answers PDF link annotation
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117a6e1fe9---58000621359.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/30932552254.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/821845252.pdfIn PDF document text
    • http://scpt.it/userfiles/files/15548759028.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/32478134323.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210912194903.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130c19cac48c---kelirodepapewesijafelida.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/99071795854.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/1102192221.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18c925622---senijilegirozizegumabuwe.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/3121266129.pdfIn PDF document text
    • http://wixoon.hu/upload/file/41847215966.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/vutukasix.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/bikazibanewutawolexudi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c4915b03---12307480378.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/55250624968.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613418f2a701f---lawuduxan.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd90229096---50448903414.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/93965391093.pdfIn PDF document text
    • http://lex.tj/img/file/gatukoletadejotibaputak.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/40905284655.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/zudobupem.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/jabaxozut.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/93422427046.pdfIn PDF document text
    • https://trexanh.net/upload/files/86902325692.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/19687671740.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 15632 bytes
SHA-256: 7912db59c2ab936c6289b828add5713ce3c85f01b282623ee664e9f60c2df5ab
font_02_sfnt_off0000f8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 11020 bytes
SHA-256: f4c366d0fae4777024d8a1661bc3335dca6e4f6863337b38be3c999a95f0ed63

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