Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b45fd5ae3eed87…

MALICIOUS

PDF

94.2 KB Created: 2021-09-04 18:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86dabad9447a9c25500b549e1ea7d3a6 SHA-1: 3d0855ade9c8a8dfa2a295a906a851b18833d56c SHA-256: d0b45fd5ae3eed87a308cbf37a3b859cf43dad6991b63d3800d7395cb6592b40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are typical of a link farm used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=standard+music+notation+practice+pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160979bec9dfb4---bolunizare.pdf
    • http://kayamedbursa.com/userfiles/file/dejimezerofofoxaturufene.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161315a967fca8---30971848514.pdf
    • https://www.domosystem.gr/ckfinder/userfiles/files/39496990850.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083297a727d4---vapedikimaxu.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/vdil1e0rf6lac5kd217ukvg8sp/dekipinerelip.pdf
    • https://apotekatia.ba/fajlovi/30624741964.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4014197b62---74402256888.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec412e39a71---larekapuxuwixaroz.pdf
    • http://s-privod.ru/userfiles/file/92817850730.pdf
    • https://leganordavigliana.it/uploads/file/resipagubozebifaxuvawu.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ec6bad078b---majiwunonexavupolelutof.pdf
    • http://adria-ex.com/images/blog//file/3408890242.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e49571277---komabulexelaz.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3fe58906dd---gobemulutiwudozipurifagin.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/2285388935.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e778000d76c---15768691428.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/58601026141.pdf
    • http://akcjonariusz.com/UserFiles/file/gizoranerefusadabugorujo.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/6f6b7102c9386610fddfa39f99fdd0b7/54504003655.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/78139097509.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef18a2efc2---fizofetokumivumisesepuno.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_off0001099e.bin
3f39e5f95af094b332dc9c71dcf13e948196e85df8353146a8a0015c0ee5203c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 18320 bytes
font_01_sfnt_off00013960.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13960 16792 bytes
font_02_sfnt_off00015177.bin
e97b8e5e1519e221bbe8dc4d2336c08c94f9c0053cec657428eb555c0e959f7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15177 10908 bytes