Malicious PDF — malware analysis report

Static analysis result for SHA-256 621a1e648d293102…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 17:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bca39e753e82a88e029dc580b76f4269 SHA-1: 52c92d6a7d2f6c681fa6f51f255b15a50cde2ef3 SHA-256: 621a1e648d293102f850bcc64c6168085261df2400ab908cc61e8d8d51f0ce7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted as a link farm, further supporting this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://oniceh.ru/uplcv?utm_term=hatsune+miku+v4x+nendoroid
    • http://studiomuraca.eu/userfiles/files/43765881346.pdf
    • http://cbestdesign.com/ckfinder/images_store/files/mamegonaxovifar.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee1905b49---dotuzebofajagudibew.pdf
    • http://jjc-dev.com/userfiles/file/mutevasuw.pdf
    • http://m-s-g.ru/userfiles/files/renulapekijeto.pdf
    • https://tigaintan.com/contents/files/fewevenu.pdf
    • https://holcom-wd.holcom.vn/webroot/img/files/rijunuxetopep.pdf
    • https://linker.tw/files/34471634724.pdf
    • http://aalzkj.love-mrt.com/upload/files/41712473710.pdf
    • http://md-servicios.com/userfiles/file/42577604760.pdf
    • http://templeton.sk/userfiles/file/78381161097.pdf
    • https://ritascreation.com/userfiles/file/wixevabemipugezogusoxa.pdf
    • https://promaxsuspension.com/csmimage/file/23219670041.pdf
    • https://servauto.fr/img/user/file/62410818426.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614115d08d551---28999020596.pdf
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/roloweguv.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/30242875265.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b86d03f435---73992263348.pdf
    • http://mirutte.com/newsfiles/files/2326321927.pdf
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/72486664083.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ff642dfbf5ffb27e67eb010d2368d786/4902928270.pdf
    • https://eletmodguru.hu/files/files/34568047880.pdf
    • https://mmeasar.com/mmeasarfiles/file/mifisepozesazivivefekilo.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/pifomisugelanamawi.pdf
    • https://dulsuc.cl/userfiles/file/wowadowatupa.pdf
    • http://restauraceeverest.cz/userfiles/file/fabosegovexemeretag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d5.bin
592c78025e4c32510143d5c97ecca7b94d7dfdb336fd178279252d1a10f4a27e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 22052 bytes
font_01_sfnt_off00010a5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 16792 bytes
font_02_sfnt_off00012275.bin
f6a3e39b68dacf0bb8d8902b34edefe7a1bd5904b55e9a838194ae46ae659a7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 10792 bytes