Malicious PDF — malware analysis report

Static analysis result for SHA-256 334e34c0490bb585…

MALICIOUS

PDF

70.3 KB Created: 2021-10-04 03:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6aeea562429753e4e403a2589d56f39b SHA-1: 1db6fb4ac09d16c70af2b0a476c55db74672850e SHA-256: 334e34c0490bb5853b03a96fad0385ff8c489b7efd56b3e0c07640e5a9ec29c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly indicate this PDF is intended to lead users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=best+obb+offline+games+for+android PDF link annotation
    • https://bursaphotofest.org/uploads/files/19901323074.pdfIn PDF document text
    • http://leton.pl/userfiles/file/55013902982.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/sosudakomawudodive.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/suruverimejajal.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613020e8aa35e---vubaverow.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/72129943818.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/15a2a70ea2e033c01687eefe4c45fc0a/volekufolixawerabitob.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/dironawuzedim.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/75668818210.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/wilisinazevodososizib.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/22715765437.pdfIn PDF document text
    • http://ewtch.com/upload/files/80710473059.pdfIn PDF document text
    • https://anfauglir.com/images/file/fimodukesufuvaxemasenunis.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4503feea3eb5f1c7b45f8829f6d1a596/92975361400.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/godakawomevo.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/80056108601.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/jomuzozufasoburibe.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/73000123336.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/061ba32c0c38a7bd6b3cbd06241ac0a5/tapowonofaraga.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910090000.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/34218920983.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/18523160180.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/13338325636.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/65598910760.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7627e09e7---40114945588.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_off0000b184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB184 16180 bytes
SHA-256: 21a7dac59a769a46fc6314c60a2570d784f2ec580a6419032f9e27754b36eaf2
font_01_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 10888 bytes
SHA-256: 898c1d6007c0e2d74bbb0033c5523aa25a6591cdcb5452ab0d4893d13bc51667

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