Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c80d840ec3d6f9b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 13:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66e449d11fc9878760e17d53ecbd08eb SHA-1: b0f1de33ea51003fe1972ad8b22a322479f8a476 SHA-256: 0c80d840ec3d6f9b2b2ae7e4edef198c87e35773df9d2c22c212ed7f31f5abce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, often used for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=partitura+unforgettable+pdf PDF link annotation
    • http://lhsclassof1971.com/clients/74120/File/wumoga.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/tituzezejomozonuwewetowi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161160e5943c5d---galile.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/93487843698.pdfIn PDF document text
    • http://santabruna.cl/upload/file/nakamukafonizopowu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e6c7a067f---56300469596.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/941775935.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f96ec68c1---logeponaribuzifizu.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/pulupikoxovidomazenukuw.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/cd633c83f28569d267e814e4ac3ba165/31427474670.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/4uc9ojgs7t0cggshirevfr44h1/93808885432.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/85254346107.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///lamurewijigakuf.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b98409a8---56711565858.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ad676fb1fd001320b56ce0489be0b57c/kanovawuvivizujuzu.pdfIn PDF document text
    • https://renault-service.com/userfiles/nofudefitorikejumizolide.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/jlllupa1ickscnqvl5q66vv3sm/86638733923.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/18420818355.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7e2e1a5a---legatudejokenelojepag.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/vizofutuxo.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/nopikodifemilowejefodugeb.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611ded3c84591---66295940804.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/207942b23952bc7474cc895f4cd5fa4e/74007063311.pdfIn PDF document text
    • http://melvin.cz/data/girovanolujimutavo.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_off0000c771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 10744 bytes
SHA-256: ce86427d236a63380dd34881016719dec7e642a4ba8685bdd81a545a533a374b
font_01_sfnt_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 20152 bytes
SHA-256: f15e5975f37d7db810a679005704d94ffed8783ec5ab8468c82c03d24b29512f
font_02_sfnt_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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