Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fb468af752d2df…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 04:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46d3eb387494b2db5ef5a5adbbeba076 SHA-1: b8384cda2540025e0f36f49a408d749c2edb4b60 SHA-256: c3fb468af752d2df763b3d98cf7f457e830d5c38caf3cc34095effc999059e5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised WordPress sites, pointing to other PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081af1b049ec---mokelatej.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0631bf0793---55701502035.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/witiferovano.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/74958511576.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099646ac2e08---pememor.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/637850ee4ce1b25e30b2b1c2fa9c2fa9/84184904541.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/an4fm75i17pnk05hpdg9r25at2/guduxu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161294fe2edfe0---74237643599.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/xovaxusutogarotemefenika.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/31398719188.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b0326ef5817b9394f0fcfeae874c3a8b/fanifedojexabo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/11c5a1ad5ea0cb16fc851bbc9c3f5096/bomab.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/12119090241.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6aa4768fcab5011df6cbe138a8755553/42734046588.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/a50dfetntkqbiqksbdbbsko24o/pejorurupado.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/garori.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/15597695418.pdfIn PDF document text
    • https://gulamanis.com/contents/files/83237296478.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/rizuxarobovilokolodepofub.pdfIn PDF document text
    • http://minipit.com/data/files/8952843811.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/teduwavojoberut.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/filij.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/limuribeli.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/zagabe.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/voviwewalizipas.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/fariwimifodobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=digestive+system+worksheet+grade+6+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_off0000bc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 15828 bytes
SHA-256: 01fcbe0ae9bbf773f818afa74ad633dbb127532fbe185a5b9719def1f8adc81e
font_02_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 11320 bytes
SHA-256: cbdbe7d4075e51f6a7bc0ffb1bce790c31e7d0058a6499ae7f0b25ccd43d47c1