Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d4acfe289a3ff5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 13:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88f3761a45b2f83d8c370a969a9cdc1b SHA-1: 0dfdf594cfb6eb38f45755984ff10e26fd55cced SHA-256: 34d4acfe289a3ff5e9e59631ef9294344b64977f9f920a255c6a2c03d0e2e0bd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catamma.ru/uplcv?utm_term=ifont+for+android PDF link annotation
    • https://xn--nmqu14inmf.com/upload/files/83977739776.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/65450501157.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109050354148320.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/52429021891.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/79521626923.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc9d930f6---32523903709.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/dabexopebuzukexa.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/70521923143.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///61086333999.pdfIn PDF document text
    • http://duef.ru/public/file/mamebizigusudopozije.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/kiwiwoxowurepipolud.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/wuxiligif.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/belidukotiwi.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/risomofabexedexa.pdfIn PDF document text
    • http://labotinnghia.com/img/files/fagapulobefopupowubozalu.pdfIn PDF document text
    • http://stevis.cz/files/file/dabemugur.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136008e40b02---najunofalaterejel.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/pupewobofexe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3abe58d7---nawona.pdfIn PDF document text
    • https://ottopianos.nl/files/59410867885.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/zadedifeg.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/7951203231.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 18264 bytes
SHA-256: 0b9141eb2642fd521a0e4b3eef9c0c08b9f2eaee7a8d6268656e394de940ccff
font_02_sfnt_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 16180 bytes
SHA-256: 1d421b758c542d3021598db92ccb08b85fa73f750ac83168a6d2ad315eb4a8a7
font_03_sfnt_off0001160e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 9952 bytes
SHA-256: 857233b638f0d03a07798dd11f10eb83ae3466d31bb4f73a6b4e9033bb9ac3fd

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