Malicious PDF — malware analysis report

Static analysis result for SHA-256 8908d40d8a76705f…

MALICIOUS

PDF

160.1 KB Created: 2021-07-01 18:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 026391861bd5b2201ea1be852c67c57d SHA-1: 864eb7207ba439730a460ca3c4e5cbbb49bcec23 SHA-256: 8908d40d8a76705feb6210a275e37a32e7babd776122c1f388ba8a863cf0533f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads, likely intended to host further malicious content or redirect users to phishing sites. The presence of external URIs and link farm heuristics indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/840fea482df6d4721f0702b065ab69b5/63923284994.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/f8e4584cd8e16f75c6f64dce9cb1cb13/37052830313.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160879cd6c004b---45820024909.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b25e887ee---womitunadawareberu.pdf
    • http://renovfab-menuiserie.com/userfiles/file/97644263254.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16070228d88671---27432193365.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160792dbd16a67---vilixizo.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5b160807---rifimujibibelixu.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0051ea4e568983bdaba4837122af96e5/piweb.pdf
    • https://napraforgohotel.hu/upload/file/50741413941.pdf
    • https://sjalikave.hu/pictures/file/83049759547.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/5f9876ea3a2894a14d26fac493246bd8/keriribotisunapi.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f118cde035---83668345129.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/63951b9d4c37693bf7414980c005adac/jazer.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/693dfab2cbbf3c2bf757ad89c4791375/tudalum.pdf
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/jukopo.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/wiputufapi.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/77dcd62a3db9b1f0dde97a6bdcf1f416/sivekanalanivugobebuw.pdf
    • http://scheiden-maassluis.nl/uploads//file/88607168711.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0218412d---lamimezewivovun.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab71cb6e9da---41116891492.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608452583bffe---pabezubivovokufekobu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=basal+metabolic+rate+is
    • 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_off00021397.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x21397 16792 bytes
font_01_sfnt_off00022ba9.bin
251e7c52b4128224d3bba63989407f81dfba4259878d76a03e5256c88a770444
pdf-font-stream PDF embedded font (sfnt) at offset 0x22BA9 18636 bytes
font_02_sfnt_off00025b12.bin
b11c70efe4f4fa0f9b133fdae434fbd124470e2caed7c670cc10be5871dc1484
pdf-font-stream PDF embedded font (sfnt) at offset 0x25B12 10480 bytes