Malicious PDF — malware analysis report

Static analysis result for SHA-256 7387f3aeb2f755b8…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 17:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07a255be3a2400d1abda45b1526d87b2 SHA-1: a405a8c245ba9fb60246fbc120532008e4a6b845 SHA-256: 7387f3aeb2f755b86f9f31b6828232e044ce481c1b7caf3a9568a7852a223da9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://krisoc.ru/uplcv?utm_term=worksheets+using+simple+present+tense PDF link annotation
    • https://inijariku.com/ckfinder/userfiles/files/poragejusasisawekanog.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadd9e78463---zumibowotagesolasisu.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/fapuluto.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/gibizafarapezuwigifasum.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/88729070476.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4c0d7b6f---31456786068.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3dd3f2f06---22678162810.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/18576727237.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/benififogeginonesexoke.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/nujufazevejamo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd6b43244---95927662460.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/97649097237.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/rlmkl3cqh8rq6ovqoklgid506r/mowokirupula.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/11937786954.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/90126995882.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bc56338b7cf37cf6178195c3bf5added/79715968617.pdfIn PDF document text
    • http://robedecreateur.com/img/files/dupafakapo.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/bulopanine.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/mafupezuxidulusokogotu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/be9eb49be4a41b46f849db721a49d078/verogitexuzogekofome.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/wimubuzajerevewesivutegen.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/futaxobaragikodeb.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791e16e1124---balizolij.pdfIn PDF document text
    • 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_off0000d0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 18060 bytes
SHA-256: 26e2e0a41d49fcb8bee953fa0a6a8f087eed17e0bc2b1f463c642e8898e8c2b1
font_02_sfnt_off00011710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11710 10720 bytes
SHA-256: 1f16687a4a3255232cf0c15af55edf3828a4b8b0c651d1548b35d82026118d12

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