Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef1a27ba0bb6516…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 14:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0cbdb61d4f431556a74f9c85dacaa5f3 SHA-1: be70698280a8223b89d8d87ed5031c3773a9eeae SHA-256: bef1a27ba0bb6516e51eb426d7ef7243318341b677fd5721388d16e37646de15
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sun-green.be/ckfinder/userfiles/files/wuralipunimili.pdf In PDF document text
    • http://alkanboya.com/files/file///medozikalewe.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/fevudavonebavimikejexu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/3e5c8ce612928f48bc3efae4750a0568/50141059286.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/nubuwaz.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/wudotabaloguxuf.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/99376678682.pdfIn PDF document text
    • https://nevisnews.com/userfiles/mewimufekerofaka.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/70efe2481ae911ca487d92d1660b518f/39798284673.pdfIn PDF document text
    • https://ags-car.com/upload/files/nivenamatenasutufosunufi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9556b2c46---lolarovokalakenafexakobof.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/12027763205.pdfIn PDF document text
    • https://questyme.com/userfiles/file/27832301314.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/delubu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1376e5162e---wavokejiviguxuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=acca+f1+revision+kit+bpp+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_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 19008 bytes
SHA-256: efd23a4f7e852058473120f70f30bab837aee6d09353138e7ddc1d694f2682ca
font_01_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 10896 bytes
SHA-256: 10da85c1fff3f1d0a029002398d41f142bbb9654cf1400244cbc7816629c3959
font_02_sfnt_off00013072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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