Malicious PDF — malware analysis report

Static analysis result for SHA-256 88093fc50c99afb1…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 01:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6edbad79656b77725d8f7a150ce903ee SHA-1: 196a8ea901b45252e0d224857c91ce6762c8f698 SHA-256: 88093fc50c99afb1e832884f1becfa00d422f995d5cb7bf104740483827ed843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/8992354810.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/g41pfrehimfdp74p11fpqnbsk7/93926895899.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eff6dcc3f10---zirijekogujojibekamuvavub.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ilv2jdccv74ehe17tbgtivcbti/41713507373.pdf
    • http://4grd.com/cmsimages/file/bunafixe.pdf
    • http://bi-acaovo.com/upload/files/wegiviforuvaxekus.pdf
    • http://www.vegagastro.pl/upload/file/97931926502.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/8d9d42c4b797d1303051de3e999d1cbe/jebesosaweroxir.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o0hcejk85qv4m2ee65epahmfq7/90997603851.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4b0504caf---rofuremobeg.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608743cf2aaa2---rotux.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a3c3fb021d72d7543b029875dc5dbb68/29574798371.pdf
    • https://nadamasristorante.it/file/17242335194.pdf
    • http://titadoorbinhduong.com/upload/files/sowugipejer.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075de7ebf886---dutunulebafideteru.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/23432149944.pdf
    • http://raegcafe.com/uploads/files/vowenaxapaliferuxini.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa52a7d020---67353874887.pdf
    • http://liddellgaryfamily.com/clients/863293/File/37994466417.pdf
    • http://rund.cz/UserFiles/File/gowavezinavozefabodujo.pdf
    • http://rapabzenec.cz/obrazky/files/kowuzoxurokogutawuwewij.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af871ec56---84069520816.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fotos+de+evaluna+y+camilo+en+su+boda
    • 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_off0000e8c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 16792 bytes
font_01_sfnt_off000100d8.bin
673b63387436652d12bb8c6a4bc0d9d6dd25a5f2ecad5bbf57e40b0f6079346e
pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 10828 bytes
font_02_sfnt_off000119db.bin
d58c34dbbd37c0c6bfaeb49ee334e2c6c0cc2946cd2073bffbb1b871d5c52d21
pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 18472 bytes