Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba2a9b4693c0562…

MALICIOUS

PDF

67.7 KB Created: 2021-10-03 16:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 134e4419b84dc2ed22e05265ed0ce87a SHA-1: f90c4575dab3e68043b8d5aca6ab08f82a2007b6 SHA-256: cba2a9b4693c05627337f7571e08b3ef3b340f418debd9fd31cf51c11d8929b8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated, but the presence of embedded JavaScript and numerous links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rowanmkt.com/Uploads/ckfinder/userfiles/files/22924064782.pdf In PDF document text
    • http://riskhedgetech.com/uploaded/file/1591300948615341eb8a6d6.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161415c670ad01---1002747066.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/lizufipixizuxukimamuxiji.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109051134326993.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210929_7C389C97143D3D6A.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e346e44df6c5eb1bdd129029999b8a3f/tijojizutilorixu.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/kudupepexijiki.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/voposarironusajuwosijox.pdfIn PDF document text
    • https://on-the-markmarketing.onthemarkmarketing.com/userfiles/file/rarupirowifozunasi.pdfIn PDF document text
    • https://penal-garazh.ru/files/genelerilexo.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109050756338216.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/29073896394.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/09ed8505459657c54ce56ad57ba1cabe.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16150b8e1ea4c7---43678459796.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59174593c---kikadorolikamuwutirerip.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109110401257596.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/79732445826.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8e9401850---50957623177.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/rajovosibapiperuribavobi.pdfIn PDF document text
    • http://amkchem.com/upload/files/sekozuxaxinili.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/gowamisakejubadoxonasiron.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/42148274873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=looney+tunes+mousePDF 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_off0000afaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAF 14320 bytes
SHA-256: 13842c94f5a187beddfc3eeb290e092d1a8bdd39a8cfc1f4d26632971a2c14ad
font_01_sfnt_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 10040 bytes
SHA-256: fb426d697f5d8eae0a5c8d0a2c7b69c89af03fac6e81cec90eeb7cff529550c9
font_02_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1