Malicious PDF — malware analysis report

Static analysis result for SHA-256 338d23658264bff0…

MALICIOUS

PDF

87.9 KB Created: 2021-09-16 15:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3ced88d70763feab00dfa9102e859a0 SHA-1: 08a7c2795a68c9a7ec51fa15c552b4343f80fa82 SHA-256: 338d23658264bff016ce9f939dc4717c71fa94965a4a222b4a5c8571baa7488d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f35d241e5b---nuxelavizujavuw.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/51452170322.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/levegige.pdf
    • http://millionsdiscount.com/mo_images/files/48159625319.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9193760e---nekumegerukana.pdf
    • http://dodogs.ru/sites/default/files/file/95240942740.pdf
    • http://saxonrt.hu/img/userfiles/files/37042733529.pdf
    • http://generaldistco.com/images/file/84952854253.pdf
    • http://mimarkamilozkartal.com/userfiles/files/65104039375.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1c5235a3---vikimonuvawonodur.pdf
    • http://topstec.com/d/files/loliwagefi.pdf
    • https://laps.pl/userfiles/file/73545114664.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613882d3ed0cb---32518770326.pdf
    • http://hrt-foto.hu/_user/file/xiruwuminufusoje.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/9528345918.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4967af546---19822518582.pdf
    • https://cuisinescartier.ca/upload/editor/file/bomixofoma.pdf
    • http://chengzechem.com/upload/files/9827425486.pdf
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/nirevutapabetibog.pdf
    • http://dodogs.ru/sites/default/files/file/5315001328.pdf
    • https://planet-pvc.com/upload/files/tudasodulevijilibolipoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gyro+test+android
    • 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_off0000f38d.bin
7cc7cdd1592b78ad60a0c9bee7e106cc38939331db34558744decf3466c16961
pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 17772 bytes
font_01_sfnt_off000122ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 16792 bytes
font_02_sfnt_off00013ac3.bin
5336948d32748476de1689737eda06afdd10aca85c66094b098a14009b4675c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC3 10348 bytes