Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b676de5f472d5c6…

MALICIOUS

PDF

81.9 KB Created: 2021-07-27 21:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f473f8f85508a125c57cfaee1312e982 SHA-1: 923f47bab22a94b3a2ccbda215f40097a11e4940 SHA-256: 5b676de5f472d5c66cbc73fa94f9c22c36fd86192190e6afecbbf03d12cf962e
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous external PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.anclupnapoli.it/userfiles/file/vidukarukazosirodefe.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/akuzaniz.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/35169763370.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/18991689263.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608040fc0641b---jusikosiketujodimikus.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d9e47a7b494992b906c7fa2273c39010/87206181411.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3a729f165dfcf0afa45b7219181458c8/sokatujufupugom.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6aef93afd---79698268380.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/fevaxamu.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/nawakikativisag.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/jobuwotunimusapenozema.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/78654853837.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/5527842539.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a740363875f---6771338846.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210531_844CADDF6AC520B6.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/44c5439445c155cb69a91a6761580ed3/wuwenalodoxi.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/zulimopefudozobefilo.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e6ffba876e987590ab0726d8c4104fbd/60891233627.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c64ef6ae3cfb988d22712ea5feed1ccb/27310103966.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210727_57E5C40E031012B7.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784da123073---kinifamagek.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/86b0cb2aae1d3a728a0d8b3d37c28996/winexavivuwijepopiguwo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d9772838fd73da5ca9f200db71a027c3/99523374655.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/78e597a275b2e2a563d3e6d401db298d/15192323189.pdfIn PDF document text
    • http://www.truckersplantparts.co.uk/ckfinder/userfiles/files/71637077419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ejercicios+de+voz+pasiva+y+activa+en+ingles+con+solucionesPDF 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_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 17692 bytes
SHA-256: 189f298311f561c3d1e2aff96435866f783d5c4fbfd15690420da669e8365c4a
font_02_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 11140 bytes
SHA-256: 90629ef947846c0e874f5905dc00caa89387fcfa98a319a6347731c1f9295c88