Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd0dc05bd80520c…

MALICIOUS

PDF

89.6 KB Created: 2021-06-25 22:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d75cde4ead1ec8e57d072950a3f4e6f2 SHA-1: 8d32aa77caccd0ebb99aefd2a1316723b7f83f82 SHA-256: 4cd0dc05bd80520c22fcfdb34eee687428d9c33850549d2e6115496abde45258
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=homebrew+fighting+styles+5e
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/rb6lhq4lv4gbpldi62dk2gajtp/18578966327.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821a1db6757---dadokopob.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/87646fe4d287215665d8ea36488fb360/34355032888.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/vncqhjgla7ls3uu1ftppau6cfh/nonuzitavufap.pdf
    • http://www.520amis.com/upload/files/wetexumigaxex.pdf
    • https://nenanhduong.vn/Upload/files/88726512060.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2udcup6amvbi7a6gc5kn6apg34/dojame.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/ba6f8aa9e7c3c812563633b5a2840319/fajirimuxekizifaroteweni.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/oajqpuo62ft53aa3r22o13tb1b/96823559478.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c291933fca---xitiketizanetepo.pdf
    • https://atphp.ch/userfiles/file/27352683733.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fe03d67267415bb712b20cc7728776db/70774608624.pdf
    • http://billsky.ee/files/file/66675188540.pdf
    • https://naucharts.com/ckfinder/userfiles/files/remoko.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abac4315887---misidavibob.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071df042b965---78075168577.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160804195098af---vapazivefoleditafufe.pdf
    • http://bajajsports.com/userfiles/file/40153764462.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b7c74d2b3dc99f6e3514eb4c0f05948e/71362422816.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c416f938f0f---fogolozegirodameduwoxopeb.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3a620b18e15714939d70c58a8d6267dd/fabonesafigiroze.pdf
    • http://rogo-rotterdam.nl/files/60377049940.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/57209273616.pdf
    • 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_off0000fa8d.bin
ea61259edc9bd488588fafcfb16530234b160ada039d8cff17652e0e5941279b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 17484 bytes
font_01_sfnt_off000127d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D4 16792 bytes
font_02_sfnt_off00013feb.bin
f2f6edeec586943891a52a113d2cf0da755e7d482999142a6dd0991b692a69de
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEB 10964 bytes