Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ed7c4f43d5dee3…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 10:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26918bc9225262d6091fa83381fbe780 SHA-1: fab9bfdd123917b5fc16727d8bc35b32e76adccc SHA-256: 86ed7c4f43d5dee39cd107e09f64003b4e194a75b584416c0820663bdee72331
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hzkontejnery.cz/ckfinder/userfiles/files/11003984478.pdf
    • https://efnnma.org/files/file/27321167094.pdf
    • http://jevades.com/aircraft/fckimages/file/bemozonuj.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160896085aa309---taxuvo.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8947b48b0945e78d70478bb4fcb4db8c/pedis.pdf
    • http://thehigh86.com/clients/13680/File/83483839694.pdf
    • http://greece-ex.com/images/blog//file/17940647167.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a80cdb49ca319d1529bbbb809b155e8c/91796817667.pdf
    • http://bulgankhangai.mn/userfiles/files/rosotoke.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee783ea1ef4---10820330075.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072008de47ae---buzibotu.pdf
    • http://modnyi-buket.ru/uploads/files/burugutun.pdf
    • http://dichvuhieuchuan.com/upload/files/6145808946.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/46006252236.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca7d053121---24217068163.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03919325f0---bulal.pdf
    • http://rghsalumni.com/clients/82979/File/49760119879.pdf
    • https://anandamsanyal.com/userfiles/file/16732423339.pdf
    • https://paeonia.ch/userfiles/files/sepovonaxojomij.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/48586856c13bfe6cd8cab62493ce75a7/37882017182.pdf
    • http://foxhill101.com/userimages/nolemezidaselam.pdf
    • http://mmt24.ru/files/file/xonovunozova.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mindstorms+ev3+programming+manual
    • 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_off0000cc09.bin
f897d7b61151bd0a9f3707c30b653db43ac5c4a206c258b1cfc98993afd45a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC09 17580 bytes
font_01_sfnt_off0000f9cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 16792 bytes
font_02_sfnt_off000111e6.bin
8def8554e03d9b4e2331fc59984c5a027b19f1a42a2016d20586dd029030fb55
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 11064 bytes