Malicious PDF — malware analysis report

Static analysis result for SHA-256 368ba0fbb2eb0870…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 11:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c364f498b8329358dc87b62ed6e644f SHA-1: a1ad4c22c182335057b55f999df50f3fbe2411e3 SHA-256: 368ba0fbb2eb08709161d03effea35de66df381aeada028d9ae0ccf6e1f36593
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. The presence of 'utm_term' in one URL suggests an attempt to track user engagement, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3333

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://synerhu.ru/uplcv?utm_term=vertical+projectile+motion+graphs+pdf PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70f28b3ca---tudapenejusowetut.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/979fab34c340b200069b6d260ca01402/92797077755.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/47517964021.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/13539414463.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/73869496816.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/6387393582.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/8718443115.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/66257369202.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/507291223.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/tikitisijuxumusejo.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607330865d276---webababotoxovid.pdfIn PDF document text
    • https://europartner2.pl/uploads/58142681098.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad879ba4d9b---58409780640.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ab2a9053---10997340594.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/l93gi2big3hc9t4bq3dvl417pt/60594631824.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/fizonemibavunefusuv.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/4ba1307164e135be8df8d53d9a1d615e/niganufexo.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/38386404563.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/bf99cc5e7369c31de6f41a7304a75d42/279711789.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/64420713308.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/pudas.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/78517803056.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 11168 bytes
SHA-256: bced1be40a3e89a8249d2d1771768d95ff46ec34fbf70fa58edc50052da8f0f0
font_01_sfnt_off000149cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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