Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6744b31aef267e3…

MALICIOUS

PDF

87.8 KB Created: 2021-06-30 23:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61fc3730172a736c319afc16cc5d60bb SHA-1: 5b9000d24bd8b7c359ec9404f623129b4b5e2e9a SHA-256: d6744b31aef267e300586933f3da6545f3f8c2a8ba6e418afc31cd5d37e0a133
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. The presence of multiple distinct hosts and the use of formcraft/super-forms plugins on these sites are common tactics for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c48407b0---52310824752.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/q814legspgrk0u65464q4lqhh8/73004003920.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3408b5e2140cead47254d8518d0a073b/72368877824.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716600bb4ec---maxuxafurexudiludu.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a32673385---mexerezor.pdf
    • http://sclifeguards.com/clients/16854/File/6658531774.pdf
    • https://armagedonspedycja.pl/files/file/39968967615.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924d30b0483---83760919493.pdf
    • https://okvino.it/file/3440253336.pdf
    • https://cardion.dk/gfx/fckimages/file/69860184124.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/93129857461.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f357e9f3b---wuwiroperilevepizu.pdf
    • https://247hvac.ca/fabulous1/uploads/files/petumoxalinoda.pdf
    • https://binarbaid.com/public_html/userfiles/file/tevebasodated.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/iqsc0gp7nun1g36cfud805cstv/22156650221.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77ec02d93---30257613401.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7e5bb5399a11d8074b58876f1ae3d48f/koxorurabewepafasekon.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/6lri74nqql1aa3j4hvssfu8j4q/79130128286.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b2563dc33---buropidogujijikatuk.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e0mgscbsg39a8t1ftibhqudeuj/43464363726.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a3c0510f60c54a3a8aecc8b5496b4b23/lerasofupamenidoguxaluko.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060305022280554.pdf
    • http://bilmatbasim.com/userfiles/file/wubegogogisodisoveroro.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+last+house+on+the+left+1972+unrated
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 16792 bytes
font_01_sfnt_off00010b56.bin
2312640122d05c9feb923a711be3faf1f346d78a4daedc67ef46b536fe2b218a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 10812 bytes
font_02_sfnt_off0001246a.bin
fbee6874e0d813d3faad51f6cae3cba8595a7a1e4ee357e87df9977aa286051d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 17396 bytes