Malicious PDF — malware analysis report

Static analysis result for SHA-256 27be193f873a5c42…

MALICIOUS

PDF

71.9 KB Created: 2021-09-06 20:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d344967a7991af8b5812781104bce0c SHA-1: f564abc62ba1e0b29d0c2ea94884092385116f29 SHA-256: 27be193f873a5c42720f884dd8d011529453b7a031440230809da0eb02be53a8
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to potentially compromised CMS uploads and disposable hosting. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic suggest a phishing or scam attempt, likely aiming to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=ley+de+marcas+nombres+y+avisos+comerciales+de+guatemala+pdf PDF link annotation
    • http://110.78.114.242/ckfinder/userfiles/files/28927121186.pdfPDF link annotation
    • http://www.almansori-ye.com/almansorifiles/files/4920256173.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa603e43428---48265387103.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/67591054689.pdfIn PDF document text
    • http://zaiger.ru/img/file/12914603075.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/timuxanafoxana.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/nalabevekar.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16085063315e79---77013560436.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/fb6f6077a6da2aa16fda0d60adb27641/69012592160.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/darovagoko.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/50781534157.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/nifegiwupakenixapuxazaw.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2cee6e91e---8716244383.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/wipolob.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/godozejenedorigi.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/67615148656.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8a32ac78---11333928764.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210705_5F8A0C28E13B4CFA.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd75e6831---pigawarikisiduwezadolapil.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/24003264112.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/59027286339.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/mebekelosutise.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/zuxexulutazo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9bf257285---49542104816.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210724004717454641vkye1.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_off0000b6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F5 11340 bytes
SHA-256: 43bbfdbb55fb423e1e039386184b18638d2121b89852679e475f9b113038234f
font_01_sfnt_off0000d141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD141 15748 bytes
SHA-256: 4cd96c7766b1f12fbb0a4ee5d64c2597afcb8f74fc21b23cfdd7fae9bfeb5fc9
font_02_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1