Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd488caef19bd9c…

MALICIOUS

PDF

95.9 KB Created: 2021-06-25 17:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f9c63fd067383c72d0a6e384b94951d4 SHA-1: 0adc367a1325d0d9908902bb5c189975bf1e825e SHA-256: 6cd488caef19bd9cdc79fd0ae8cd8908c9e165816678211779b153bdbc3d265e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites, many of which are WordPress installations. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves embedded JavaScript to redirect users, suggesting an attempt to lead victims to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/84a286de91414e2d05154b17d82463fe/9548052783.pdf In PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/vfgd4ourhu085g0qssnsiepbgk/fukotuletokagotujeroso.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d7d0d2fd6---gexekalilowamerilanojuki.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/tavixejavejuvugepenatu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/37767651725.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/458db2a5faf25ea7a26f8786ad464d7d/sukijatozugujeduzesobunuw.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/cb33c7ac238ff4c957bf5e066bc7171e/xusiwekojitodo.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/1415664335.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/xelax.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/53359201651.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f71506ca8---40897000486.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/25499526729.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/30e90ff7542df3ebd0e96954ae4f4459/38092944365.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb890e833f9---89022804952.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/wokemavizegapukamip.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b024f81c7ea741c667e11e620d063c4c/39563043601.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38bbd26202---jelukikafisibufapomebegow.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831415ba61e---bokozomasurago.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/67af8f021d960616fc9d7ef85b62c72a/kibabere.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/taxepowa.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62bd9343d3---siwixubonedidipiro.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/90014168891.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1ffce5d7---3578816065.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/rolefibowebegomotinifor.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b392b146314---75869834558.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/kasunukevubikezasawene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=largest+congregation+in+the+worldPDF 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_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 17492 bytes
SHA-256: 553ac7c0a7f2d34b367487962ff7c14260e39b1eab2991708edb8289199ec621
font_01_sfnt_off000141a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BD 10692 bytes
SHA-256: f917f941ca625816847573a1dd5cee4ab4056167118152dbe696231df51581de

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