Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac798292a7bdb005…

MALICIOUS

PDF

147.8 KB Created: 2021-09-08 11:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 790978ce0bd873e11464167949683276 SHA-1: d6987dc3814fe925bd6c602ff6caaf1190c7d636 SHA-256: ac798292a7bdb0052c29e40e01ec3f68af116f3ffff31771b8b4d2999a8405de
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm hosted on compromised or disposable domains, designed to redirect users to other malicious PDFs or unknown URLs. The presence of external URIs and link farm indicators suggests the primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://medvor.ru/uplcv?utm_term=understanding+ecmascript+6+pdf PDF link annotation
    • http://webinaris.eu/ckfinder/userfiles/publics/files/zalisufodasepowuge.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/6049661848.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b1daa2983---1736872683.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31fae003e2---399553077.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/03270bae5d6b288325535f06dd94ef91/telun.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/irdqc4stusbcdolnf8tjvto906/53521682328.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/11621023048.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/zijobipokisafuf.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/lpqpalvp3mr1l8lp7vliiqp957/butofopo.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/votaloli.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161131e2d64077---tamoposeberikedabuxim.pdfIn PDF document text
    • https://airbays.com/userfiles/file/muvobenevedoweridotokel.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab6abf45e---gesaxuretajekorewojezov.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/13184616395.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/43249659686.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/kagolotizopelop.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/82984131171.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/wivaxe.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/tekozuwalepitojen.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/697751872.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_off0001d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D29C 19396 bytes
SHA-256: 128134db140e9ca4a2ad7be09670c11c40bfea50ccaeca531b760c8c50b7b844
font_01_sfnt_off0002057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2057A 10972 bytes
SHA-256: dfeb8be23fd3f0a78a2e7e78449f2820bba09323d21259e158d15eca7bae0bd9
font_02_sfnt_off00021eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000236c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x236C0 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560

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