Malicious PDF — malware analysis report

Static analysis result for SHA-256 a107982c414b2bb6…

MALICIOUS

PDF

76.5 KB Created: 2021-09-04 14:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8cb0aeb3b18ce72111fd8c94e0648d53 SHA-1: bb87c236afe382d0f1c8d5c41fc914dcdc1a1bff SHA-256: a107982c414b2bb6e465c5760a58da1e6b6fe9e0d13e48710dbe89f8af957160
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites. The presence of multiple PDF link farm indicators suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://contrast.no/ckfinder/userfiles/files/67018036716.pdf In PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/59b9014f57bf0d4f218f5553feea55c1/79507865217.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071303484846.pdfIn PDF document text
    • http://zaiger.ru/img/file/mativagetidorolegekan.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/74694481000.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/79197021716.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/59262188790.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/ruzedomoduliguliwul.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/67155647590.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/05fcdd0ec106c95a78384e0b6f8899aa/98362790973.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e31d28453b6---tetojiferavoluxasetelewo.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/11927f2d578ffe61508e3bbab65c9ef0/tufiwenitupu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/58bd1c5223149fdb5ef93082065a51e0/21554153856.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/repavibuzojizufovunagigi.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/xopidamodubusuwasowi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608359efa493f---99603885526.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/bafelosesit.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/15783753568.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/vovigarumunojetuzolovo.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/74799998794.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/75981799774.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d26492e8a6---vogazasopusoro.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/godemulopawurojodeneje.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ebf7fb84---98118394279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=examen+de+ingles+b1+cambridge+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EA 11020 bytes
SHA-256: d82b208208952aec3fb2725d323a979b682b02d8603f501c0a79194bdd88a16a
font_01_sfnt_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 17768 bytes
SHA-256: 7f2a239cbe042e74f07c798d7f25e95519dc45947719ebc751c52d124234b837
font_02_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1