Malicious PDF — malware analysis report

Static analysis result for SHA-256 040a09cef4690b1f…

MALICIOUS

PDF

93.3 KB Created: 2021-07-01 12:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c89b26048fd0db94fb8ab31a5427c928 SHA-1: c430b745044cd1e2af1fd2b8f2dee9de85be49fb SHA-256: 040a09cef4690b1fac98f3fa3a2909a1d5783b424a6535a2b1cf6dbc55d26a2e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/855647ddf4fb83a7861cf036703c3a88/77058750731.pdf In PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/4e9829bbdc517b91ab291939c50e4238/75559431311.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7d1f4c1d8---44107642516.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada52c73dd3---disozupita.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937d69afd40---32446746090.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/wedemutiregelugibefaxipas.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/051c7bcd44d3c03767e9ebf956d5fd6f/pabukezutodizuvo.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/jitamubot.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/29189633115.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/9a736d1800267b7e29e339e91e9ca2c6/xogukilibimife.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc228dcf66a---4344357717.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/504b2d5d43547f98a5635abc47451a4f/15656516980.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfbe6d1f7d---30479364138.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5187528083ed031e64fa1a811da6b750/jixarema.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/65480415296.pdfIn PDF document text
    • https://ewt.cz/res/file/60176920151.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/levozapuver.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/129e4ccac35e45510f5670d52ae410d3/mibewa.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/rukemezanonigufu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608900c9aa960---62232794518.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b22fbe2e302---bugifidosesosimu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/simf7kkatgmr87s70ribdpltg1/difeloj.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce50b7769---69090103203.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210628221018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=to+be+immersed+inPDF 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_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 18076 bytes
SHA-256: ecc05a349e32324f681dfdfceb1605346c3ae8ce3d99f03287a781a2f90e7a33
font_01_sfnt_off00013903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001511a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511A 10208 bytes
SHA-256: cb13c2fe98bee2af58ecfef73da40d3aa9a2008f5908ec8b33e2cd1a4be9f693

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