Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3c16e19257e761…

MALICIOUS

PDF

89.2 KB Created: 2021-07-31 14:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d933f70cd8a6120a533bf4dd2cc0e665 SHA-1: 79e5d64e3746234530c471d37f400731938cebfa SHA-256: fd3c16e19257e7617550f23111826469f478f455f791f5c7721ad77479639644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection 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 0.9985

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://redfordunion70.com/clients/869360/File/13890096955.pdf
    • http://livilgirls.com/files/vajavebuni.pdf
    • https://mfdesign.hu/files/file/69164666575.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/koxelazozupukulako.pdf
    • http://seanmore.com/userData/board/file/wobiwuxuwagorobadozileza.pdf
    • http://kleiberit.ru/files/file/sedupawonubijofixerak.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/bfbc9a7d668f525832571795ee1a163b/wusevixigi.pdf
    • http://whatdwellswithin.com/file/74714955067.pdf
    • https://accuratesearch.com/userfiles/file/31067231985.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81066f27ab---22564103434.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607243ae50b95---vizusuvufeb.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4aa059280---gojegutit.pdf
    • http://stl-hk.net/userfiles/77652891513.pdf
    • http://auxerretv.com/content/public/file/86516136894.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/fepimukafofilogikezujekew.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/7074195b07b44bdc8df9da636c3cf6cb/10129612851.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/eddkdfqngsph8r62oncud17dpb/bazalajavetusuwixoromege.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160decfa15be55---74574398732.pdf
    • https://vnsteeldetailing.com/UserFiles/files/83466819246.pdf
    • http://kielcenoca.pl/files/file/tubuxupivubojuzujogas.pdf
    • https://eksiliotomotiv.com/upload/ckfinder/files/jaxaxijigawitazamitotara.pdf
    • https://glycocalyx.nl/userfiles/image/file/10222324276.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713324de53c---wudejutawivopamej.pdf
    • http://bafiti.com/sklep/userfiles/file/vipugexowofe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=watson+glaser+practice+test+online+free
    • 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_off0000f9b1.bin
c26294a5877fa0a09be0edb600c7eadc3d964c3c1c25bfbf61640ea20a6c5070
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 16756 bytes
font_01_sfnt_off00012565.bin
9a41ac889004708d125783fc12c9159c1602b9654da418147bc8765c2b54db47
pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 10648 bytes
font_02_sfnt_off00013df4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF4 16792 bytes