Malicious PDF — malware analysis report

Static analysis result for SHA-256 03539174abe12b0a…

MALICIOUS

PDF

88.8 KB Created: 2021-07-23 07:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 896a32b96ec964e1e309ca456e713c9d SHA-1: 02c1019f203dcee26bcd1cc6a28373eb529fbfd4 SHA-256: 03539174abe12b0a7da6513e65045211fd93a475ebc2633ec5f907b89b6180f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the document being a link farm, with many URLs hosted on compromised WordPress sites. The embedded links suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805ccc5fd24---nimigeme.pdf In PDF document text
    • http://beautybybelief.com/admin/images/file/11437989477.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4ce217d9ce32640804975845923ce0df/mijixuxodijifefefo.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/serofizuxuxuzepusenofupaj.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/29546944973.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e87817149---tomis.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/k64oknrkr3dlptfep42at4nqf3/6787709118.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4693530f4fb967fa89751c5e6b3b53f7/89719651281.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/9487a618a66c7e139deb0932e70ccb4d/2929559262.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/6491942376.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/34231247364.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/o5s10c5g8eh59j9muu2esk9ve4/21876325218.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/pirabazojaxikuxutifamam.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a6607edf5d551d4f2d9660bc0531f6d8/ratumixanobikezi.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/rejidazujisowojemowaw.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/606204acaeedaa3e84d373d0a67a3212/govuluzasegexomete.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/monuremolafuki.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b1322fdde---kamiguladogigonevepunus.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/vepexilegibu.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/kaneru.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/wejonorizopuwinu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/69hb1q56ilcr4a7mjt959mn5j1/13696411198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tiny+little+black+flies+in+housePDF 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_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 16532 bytes
SHA-256: 091fea8473731848f2739a7b435ad5b7ebb2ddc461341e886370beea2456dfff
font_02_sfnt_off00013cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC7 10744 bytes
SHA-256: 9c030136559d899b351e447dd4205041d0947bfa41972265862e5c2cc68af903