Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a47cfecad3aba6…

MALICIOUS

PDF

344.6 KB Created: 2021-09-06 06:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc8f8851496f6a7befed3cae04ced17b SHA-1: 248ea4c617067ebd642b911d2b4a3cb35223c4ff SHA-256: 10a47cfecad3aba6478946850aff10a9613d169ab5940bba4defc66fe27fa3d6
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains multiple links pointing to compromised WordPress upload directories, suggesting it's used to redirect users to malicious content. The PDF's structure and embedded links indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 5

  • 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.
  • 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://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1t2mchlplbkfb31p5d9g0j04i1/34337537083.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d22c5e2385cc186e6d83e74cf890aa6a/85380586802.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/gelesajufamax.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/juxixetetalesojepusapela.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/bixevo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/mudepuxinagujikiso.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/vabuwura.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/kuvezijavedamovozeno.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/nj7a1k3bfpli3n1p3cvnjrklc5/39467911874.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/pugajasajipe.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/95660765520.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/157b47cc5ec769c32872d3d7ae7f0bab/96637155077.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/57776627939.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/10731394445.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/wixamiraguxubugipuxeki.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210803034256_868927940.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ngqvqmk8jvujgqjf77vnfhhac6/wujazoja.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/80793241924.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff54fa08edf---92184779064.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b32be922c3---3138056718.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/hlpsmiusft8cesecdtfkr3vm31/11996599407.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed51d9a0700---pedexerevaxavovi.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/31096316267.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/nokawulikozowozojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ethiopian+civil+service+university+entrance+exam+result+2018+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_off0004e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0004fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAB1 11752 bytes
SHA-256: cdc80e76bb7b9cf1e69ac4054b8bd44ab44277ce8e5eeb4e3c37f4c8fc7a8ca9
font_02_sfnt_off000516b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x516B6 23152 bytes
SHA-256: ca698f824245fd4cab534f3c9005600cf91835cefc0858decbe74bf51974cd90