Malicious PDF — malware analysis report

Static analysis result for SHA-256 067a36a5b25a74fa…

MALICIOUS

PDF

87.1 KB Created: 2021-07-06 14:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54196e7f22f81d53095da8e89ad1da6d SHA-1: 7dbdc1103f6851cb2473c5f332ca1cf59f0a7f6b SHA-256: 067a36a5b25a74fabe9bbe27819476befa4e2cd61d0492d37b090f43d075074b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nomylo.ru/uplcv?utm_term=speed+post+delivery+time
    • http://jfe.hk/userfiles/62117773151.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ab9082d05d948645739bbb65a45f2693/11285582198.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e2f63311783a28daee5ed9ad43a08f1d/faxom.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c210393ac77---zukibizivaxajebenapusir.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7479a8e3e5526caa72aca12d7877928a/doliredaduwuxasafe.pdf
    • http://autoscuolecasetta.it/userfiles/files/37339045201.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad4e77a84---90354227012.pdf
    • https://agrimal.pl/userfiles/file/walabikezuzewejisakol.pdf
    • http://atenngo.com/admin/sites/site/documents/72094686182.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/71c7fdbae0a4239d805db434e7148a8f/39196168886.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac86d936f53---33094772029.pdf
    • https://semagro-msw.ru/pics/images/file/54876775922.pdf
    • https://publicbridge.pl/userfiles/file/mezazunekavog.pdf
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/vepabetegosurav.pdf
    • https://cpsguffanti.com/uploads/file/duxozavororolidi.pdf
    • http://hiddenforrest.net/clients/76790/File/37547106381.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d84ebc058---66642636229.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/87e5998891f2cb939f284aade1287124/jileko.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608f680f98c40---majovopamulebogetolobi.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cce58fc1a---21926144526.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16090f4bcd676c---titevunagupisi.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609af621d9b8f---52647064555.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1997d2ad4---supebawovamik.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_off0000f244.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 16792 bytes
font_01_sfnt_off00010a5b.bin
0b955c1f2c6c945f896e871e00151a577bc01167a08450fda031161d4c8f91d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 10540 bytes
font_02_sfnt_off0001225e.bin
36f491c5c7f16eb55f2bdc12adb94d1c37490ec242a1f9c542425b4450e72297
pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 16940 bytes