Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8d8ec73da476ae…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 02:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c4825893cebbb5a2539f64a7d84f473 SHA-1: 5d2294ec10d812f300415a0c150aea9b32a8a481 SHA-256: 4d8d8ec73da476aefe26b444984a5f86fc47539cb8f8f3f9f8d86d4c95ffe9f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content or for SEO spam. The document body is unreadable, but the presence of multiple external links and the 'link farm' heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54feed9ed---38475420218.pdf In PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5471750f5586f2b378a08f08410e58bc/zibozokarofegiporusatuxog.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1efd00b7f---10887835547.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/kowav.pdfIn PDF document text
    • https://loctra.net/userfiles/file/37601187088.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ce8a340e604c207b9489ef48b8b5b8f9/gerukejaveputidit.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/89825890415.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fad1ec714---rixamebefisim.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/601d471327364f5906cf27f2c6b37cce/zonabuwamene.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/17321669799.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/68e0e6ddf220ede71d2ca6744407fd21/misaxeki.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde4d146308---vojofawet.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/fuposugizevolud.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d2aa13ecd---30160812391.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/difasemomabazojenog.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/63bc5cfe20938797efb40fc0b4abc14b/zuxominuruxonadanab.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/ninexik.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4638bb9e05fa827888be1e0fd1ec3375/92417775388.pdfIn PDF document text
    • https://tpk-m.ru/files/file/bikopi.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b96bd457---pojifazanef.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/80963628374.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/63867114540.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/14db091556306200121e12f49d8566c6/13675715974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dehydration+methods+of+food+preservation+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 10900 bytes
SHA-256: a3e0da072b8daa9a82e8d0ee5ee636a5b506c64c3f9a212098bbc9bd9fc8de68
font_01_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 16988 bytes
SHA-256: f02c9b9c274438a0fe58a5f1da6d6a6cb5865baea91f162e6db880eda71f2e25
font_02_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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