Malicious PDF — malware analysis report

Static analysis result for SHA-256 5731457fe84f6877…

MALICIOUS

PDF

71.3 KB Created: 2021-09-08 07:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fbf35e1e0c3b0aa9df1f01e5aa8360a3 SHA-1: 2bf7ba6964e07f7810253f3516d6baa24cf2ffb3 SHA-256: 5731457fe84f687787114b659e958bd5c97800c00f35b4eee31a30a7a2ec5f26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised WordPress sites or hosted on disposable infrastructure. The primary purpose seems to be redirecting users to malicious content, potentially exploiting vulnerabilities in their PDF readers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://webursitet.org/Files/file/99643023031.pdf In PDF document text
    • http://planbmedia.hufiles/34195972711.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/hhpu9d9gruqa9vn8jn6d2o9p7g/nuliwigego.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/68865038674.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/4af7720c6d64c33d91cf0b21ba1e4ad1/50331160332.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/63481344666.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/bizaxexuleruxezabiromini.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a3b71c17d---48211684056.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/86600284120.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/gugilorewunopuwita.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c1d089b0a---tuwemixugegilisabav.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5280d77c888c3a7d10a8da6080c5e497/67970322569.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88ee4d768---zidiwotemaniw.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/nafebozuju.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/vowitulokiwizupibi.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/28274721753.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/3277693458.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/moxagowakir.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/37885109252.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/60621269023.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/28084814635.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/s3fvje2l0t2dasjtfc88gipt0d/79943878214.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45a99bb54d---jologi.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4km78noofijfq0pbmpil57cpe0/denugamuzunodot.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/26643537748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=classification+nyha+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_off0000b6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CA 15908 bytes
SHA-256: fb8448cb065d038e65208d8053bd2252b308930c64780bcd5ce5fd9f512c6bb6
font_01_sfnt_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 10632 bytes
SHA-256: d6ed85fb5e5129bdc3662763ae68ab9c48fd9a6576fd12e3a2fe2dd059540b10
font_02_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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