Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d98c78e0e739646…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 16:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 527b3b3fcceed8ea51522953ef74953d SHA-1: 620fdd763113984ba47fdeb8f3ed5637bb1321dd SHA-256: 6d98c78e0e7396467b6d26bdbfe5506824987445d3644e93c17338b9ef00b189
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, which host further links to malicious PDFs. One heuristic specifically identified a link farm on disposable hosting, and another flagged a raw IP address. ClamAV detected this as a phishing trojan, indicating a likely attempt to deliver malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://caraudioshop.ro/mm/file/fugekolega.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eea232abf9---29845384454.pdf
    • http://consol.hu/images/uploadedimages/file/73475416655.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/nurogoledamopa.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4497d232e2---3795164637.pdf
    • http://elazentrale.de/images/uploaded/file/danifemotadepitiriludifos.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161185c341f977---wawobewavuvevimoz.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78b8be710e---53722309999.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4054c4d5b---49675598117.pdf
    • https://abugfreemind.com/userfiles/file/25585581281.pdf
    • http://libertyquad72.fr/userfiles/file/sevagawupovun.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf06c53d13---lopamirutevizeloraso.pdf
    • http://stromzeleny.cz/file/vubanowel.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/00e066251ba27e7d27520773c5193778/46854917300.pdf
    • http://szkolka-wiercioch.pl/files/file/woxipuridap.pdf
    • https://activepymes.com/pub/file/9412589817.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afced87c92---61991150071.pdf
    • https://indobaliart.com/sitefiles/file/26236857092.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3b9f84ae1da5bdd361541a6b50ee91e6/70698813165.pdf
    • https://bleikss.com/userfiles/file/41897801632.pdf
    • https://southernwashpros.com/nbloom/fckuploads/file/wapusewezojukazuvusokir.pdf
    • http://kemnhapkhau.com/upload/files/37962495431.pdf
    • http://sequoia59.com/clients/867919/File/diraxapitinodi.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78870400095.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=western+digital+my+passport+wireless+pro+user+manual
    • 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_off0000de8e.bin
c1135f31282ea9c8a0d182bb530b7e97d824bd01f37f355084f9d8cff7991c2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 18484 bytes
font_01_sfnt_off00010dc7.bin
102769005dc2b3e94b2259ded764a26171d6fdad36e645ce3f2fe42f4cb08de3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 11028 bytes
font_02_sfnt_off00012746.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12746 16792 bytes