Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db904af96d26169…

MALICIOUS

PDF

68.5 KB Created: 2021-08-23 11:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14c9134ae0217246b9138f1b749bc755 SHA-1: d749ba323d6155e34342ba107c87cf1d366a4a25 SHA-256: 4db904af96d26169f777290744a66cea6f80259bef855969add7ce75932643e4
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9059

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=the+complete+guide+to+ecgs+pdf PDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160771a0e4fafa---xuvawisetesagifunimoxibaz.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/56011863668.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b0cd88138c02fcbae47a48a9975d309a/rezunovusapavukol.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b36b3800073bfaa98994f8eff16eb257/82730009159.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/99066006938.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae38355cb16997da0337f62682bc7fa7/navum.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/33531e10a3f4002f330ad8e0fe01d4d8/vuwedekinuwotafofig.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f4f9a1b1e979cb60d910a289641533a4/kazinadesiditenomomi.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/cs4jv4ultqsuhp7kfhk6obvu6n/83673305531.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7d6e5d85df3ad6ff58b1a277faef1f04/75047065763.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/dg8r1jaqifig084e6c78295a9a/80223356790.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8c2aeeb59ff73f62eff06ced760726d3/37751803220.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/mekivuxabisilibar.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/samatav.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/derulagifu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e659f204cdd---36949913865.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gasimimubidikomozitu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb108435e---dajonimalemikuvafenileg.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e01941b1f---dodeguzazupiretevomagovi.pdfIn PDF document text
    • https://t2sc.me/userfiles/89925499459.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/jazaxopadan.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/97627793173.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/cc3f5f4c2dd55843b09d41ec4848bee9/mibav.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/zamezelaz.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/l89ue2ita9c0eukcj37hi58gbn/pamixeram.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 10764 bytes
SHA-256: 75ade145b061c9bfa453197c09b772d125a25e25afb47f4eb46ced8c025d5a9c