Malicious PDF — malware analysis report

Static analysis result for SHA-256 0790c855d83edb27…

MALICIOUS

PDF

95.5 KB Created: 2021-07-07 07:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 217f241fb38554214d1c4231d41160da SHA-1: df3c5b67f6bdfb61475d3d358c66fc1eb8e497dd SHA-256: 0790c855d83edb271eff3634e258bb7a7deb3d1fa7c76a51380749201be52398
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f4e177380---88038824481.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/31dba547bc328fcddcd6fdf4e21e5021/gexafokalo.pdf
    • https://chiuman-hk.com/images/file/14715974032.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e1bd2f6e5---88631743545.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d8e5e64db---kijoma.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/92299259990.pdf
    • http://chi-kara.net/userfiles/file/midejoxomi.pdf
    • http://centronegozi.com/public/99686571778.pdf
    • http://alnadaoil.com/userfiles/file/24159853029.pdf
    • http://autobedrijvenindex.nl/images/uploads/57306144839.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5545e707---55352537552.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c47ac7ae890---benulidomube.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d0aec5b07---33764072937.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec21f545c2---zilulapogewid.pdf
    • http://primaneighbors.com/userimages/13024156994.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa9f28766---xufisifeponubodukiv.pdf
    • https://abe-rdc.com/userfiles/file/budalan.pdf
    • http://scheiden-maassluis.nl/uploads//file/sarufugapavavav.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed2f468821---71227550190.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/gn3io1nfnhhnkktlscd6cvnfl1/41389702640.pdf
    • https://nibrasimansch.com/userfiles/files/43650854594.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sogatemofujagitixodob.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609156ac2e0ed---toweme.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07790251a2---domofolinegixezebaxilojop.pdf
    • http://kimandyoo.com/userfiles/file/soziwolusapariwoguwuxe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=plane+wave+function
    • 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_off00011190.bin
5649742b086fe8a5cff32db69b92fb1977f30900dbec964dbe764d8ef7319055
pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 10312 bytes
font_01_sfnt_off000128fb.bin
c406c35ebfd805111db3b65838a9c12c51c73158c5a3f1afa730283ee546df46
pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 17784 bytes
font_02_sfnt_off00015738.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15738 16792 bytes