Malicious PDF — malware analysis report

Static analysis result for SHA-256 2916a0a689e9e29a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 02:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75e60f33c2978fbcca05ab8562d355db SHA-1: 8dac7eca648fe38e32c21de3f9e8fcdde0c418b3 SHA-256: 2916a0a689e9e29a1a1dead0ea868dbbd2f3109056543df6db8d6309810a1573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to obscure the true destination. The presence of these links and the nature of the heuristics indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://awlights.com/wp-content/plugins/super-forms/uploads/php/files/e927278e154413657e5d1f331a083345/jebejadovetivaxuxa.pdf In PDF document text
    • http://yuqiaohome.com/uploads/files/202108200019045520.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6mrjqccn595ck9ntmhb5o8bsl/21305241026.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c4dd7216f---62523711015.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/94218835892.pdfIn PDF document text
    • https://lordoptika.hu/files/files/pokurabiwalo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/933316b085c0ca1abd683e13939a5975/9279787317.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/kozuselajuseja.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/77ec2e486626557a27b156644b22a5a4/35757272259.pdfIn PDF document text
    • http://vhktn.at/images/content/files/ronuxezupamukelomu.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/6198941520.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b663ec05bfb1abb3e8740eb116b56e4f/sozuz.pdfIn PDF document text
    • http://allycatering.com/userfiles/sejajelatopabajow.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/banekejaxuwowevurirabisar.pdfIn PDF document text
    • http://119pump.net/d/files/noxoxosed.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/66542120184.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bced89b8530---33223512445.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/22f54fca1cab01a591e1c0cc8510901a/80094989134.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/9bddb88ab44d5bd33b36ae617bf40c76/55387396390.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609673560540e---70474107945.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/72212758762.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/molulenojajixavotiresij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+dress+trad+gothPDF 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_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 18436 bytes
SHA-256: c25240f274fff65a16da596228348e182cdf2b046df07ec6737b362a8bb9973f
font_01_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 10360 bytes
SHA-256: 4ffd7f3272878ce51c8185505010f3a99ae0a2b1a9a5cb1170100af08c8cccaf

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