Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac81eb7b4faaa40…

MALICIOUS

PDF

88.2 KB Created: 2021-09-01 06:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6736eb84c59278ca3915a6fd3c0ae683 SHA-1: 6bb6133553c3b1fa696ae86d3a4ccd6bcd0b29dc SHA-256: 0ac81eb7b4faaa40905dc86b2299ce1473f91a519c6ac908667a8ca506d55486
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a fraudulent number, consistent with callback phishing or tech-support scams. Multiple URLs point to compromised WordPress sites, suggesting a pattern of hosting malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=upper+pines+campground+weather PDF link annotation
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cd3c531c4---89693372565.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609655de8ac36---12738884566.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c9b34f5d1---68511544307.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/5737686818.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/tigivigevaxu.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/tutilinatiludukirokirozo.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/redosinupod.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/80900075940.pdfIn PDF document text
    • http://agenziadiviaggiocagliari.it/file/44107452360.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7abeb567b5---tixubujovifufipute.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/teleg.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/33349788398.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/64071219829.pdfIn PDF document text
    • https://activepymes.com/pub/file/58187415452.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/lobuvigitifokesep.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/56781305650.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05a6c9315---2920259189.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/69734347157.pdfIn PDF document text
    • https://windsbs.biz/files/file/lesapuvim.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/73157912558.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/d28434965cbf95edda701d09d016c8cc/kokegobanawuw.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3f19cd372386f9bf0ad7f565335e0e09/30276237129.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/23644192176.pdfIn PDF document text
    • http://lawngo.net/fckfiles/pusimexetanirusot.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26359349de---guvasekux.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_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 17476 bytes
SHA-256: c257b7cf88652d46af0930fb8901d102b4e4ce1bca002a398701bf089b3d0919
font_02_sfnt_off00013919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13919 11108 bytes
SHA-256: afebe3c75b5bae5c9580e0106ffb148ab1647fa1d9f7057f6bf9ac3a19bc1622

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