Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0e2b3b7ac06bc4…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 10:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 350d1e139959a4e29011eccf92e87b3a SHA-1: fb9da02ea8423a52e21577c6ce4089d393730895 SHA-256: 4f0e2b3b7ac06bc4d60ae772fa1ac0bd4c7791fdd794c527e4d7527656216fa2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a callback lure heuristic indicates a potential phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/2f95168170914b280c7ef0e419acaeb2/38241082437.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8359daeb---gowalawe.pdfIn PDF document text
    • https://ccskin.com/geektic/files/zerokudetat.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/pemupagekosi.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///vumobofipexu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7bbb0bf27da88bc8bd6eeff3a81ff384/51417510755.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/kukiriludedopovaxix.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/jategapewakufa.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/togefemogezukijege.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/39123387354.pdfIn PDF document text
    • http://saydersan.com/firma/files/zivexopeb.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/fa7eba7a9e7dbacc9441a4417e9268a8/saxeri.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/tojitofedabel.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/50748230389.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/34313186135.pdfIn PDF document text
    • http://93564497.com/userfiles/darudapiruguwugakikamefiw.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c7e1961c7---kefapazewopenesupixevofit.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/kakozegiwuwomimiweral.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/vafibi.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/55651508427.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/13070459431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=rabbit+farming+profit+calculator+pdfPDF 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_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 10948 bytes
SHA-256: 5814028af6f106ee28969cb33a4de9e9be4408f2be3030d415069104dec869e0
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 17848 bytes
SHA-256: 560d8eb126ba87e4a5a5c4d5447a3d10e99101b9c7f96f5e6e60cb26530bbc13

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