Malicious PDF — malware analysis report

Static analysis result for SHA-256 351f5ad64e3c07a0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 22:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 22f0620d073fecb430193cd89a328806 SHA-1: d701ab21b53b3189a513bd99bd94dcef248353e1 SHA-256: 351f5ad64e3c07a0c20b849cedf14774f195944b2d80293c2f290d2ecad802c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=physics+syllabus+for+advanced+level+in+tanzania+pdf PDF link annotation
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb379e42bd---48595445264.pdfIn PDF document text
    • http://amandamaitland.com/images/file/12819124051.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/90490238861.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/tejotu.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/5002560193.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/pavokibifezolaralez.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nesalegudojudutul.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/032cff76e7b3776dd90c49cfb76806a4/97117955020.pdfIn PDF document text
    • http://haki.vn/uploads/files/dorivalematiwepedi.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/73471107017.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/3tb8ant0hi65noep74bpqp2j36/rijaj.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e01192f6---37345120836.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/75141383064.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/biwugapawegeronusoma.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/kadosevotajifevuranitu.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f5b94c5919d239ce08fa98584b45d964/xabafuvenezanawiponek.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/74152785061.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/08/10/72905420640.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/kilazilubejum.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/kemetapebawusoki.pdfIn PDF document text
    • http://indel.sk/userfiles/file/95669373948.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/40148902364.pdfIn PDF document text
    • 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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 18508 bytes
SHA-256: 9b79187c52f14a280e4b4a1f2a27a47adcca2af01240a1c7eb262d824e6b3fe4
font_01_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 11200 bytes
SHA-256: c661f3d560532a0e418f5b737bf1e7f7e95c43e78b68b8f4d5774bcafb478516
font_02_sfnt_off000129fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1