Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb980972b4a05ed8…

MALICIOUS

PDF

88.1 KB Created: 2021-07-15 17:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f821f3d62d87cf9c41c192922318634 SHA-1: 27b9c90b708787c08942626d3755d34234432dbe SHA-256: cb980972b4a05ed8c38cd95392ec52ed11384d73d642e42ffe6608fe77b8b2af
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that exhibits characteristics of a callback phishing lure, prompting the user to call a phone number for a fabricated issue. While no scripts were directly extracted, the PDF structure and embedded links suggest it may exploit vulnerabilities or redirect to malicious content. The ML classifier strongly indicates maliciousness, and the presence of numerous links to compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160742a2e28cb6---59709524027.pdf In PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/l5q5nopusk95tlacqpu182q0u5/wonubufovovuze.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd4a78cc72---piguziku.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/16411928907.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/20472910883.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845fe035081---8780804498.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/janetovulitigijiripag.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca9976211d---bixokozaxu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160827b37d7914---30731796913.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/dipuvi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd9fc94713---fetilubesaxarunarikalolef.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d3bc30fd---39917684645.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/58664641057.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0f89af6f0---80618975134.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/30850657284.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/b8e6710ac1de4a74b8a05edddaa4ab4d/razavonugawijukadinada.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/funapujodu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b98efb50f52---wawusajifavo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a91bcdef6f6---31123213392.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984694abf27---rufamaridixi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c284e7a0328---matasejebiragokiges.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jevuxajulukofujisanubute.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/89024979367.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609287ce8ad2d---58297243363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=clean+desk+policy+email+to+employeesPDF 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_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 17064 bytes
SHA-256: 7dc6387cee78259d74c5e67dcac9a3763777a75756f26686932154794e7d1ea3
font_01_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 10812 bytes
SHA-256: deb207b873f6be0562713d08f14edefc7956f9d1d1d1b9e52db29ce8f53e1b02

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