Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c67e60877d5ad48…

MALICIOUS

PDF

85.1 KB Created: 2021-08-13 14:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06552fddeff3c30d2cdeae3d0db601e0 SHA-1: a618daf4b75ea5803d678d3f45fbd2af5160e8e1 SHA-256: 8c67e60877d5ad48cf66fe2c82fade5b5545212576400431cb210b9de5d6b0a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of many URLs and the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://oniceh.ru/uplcv?utm_term=rajina+rimal+mp3+song+download
    • https://stradatextiles.com/upload/ckfinder/files/22327737918.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc799bef5b---80574600567.pdf
    • http://thunderstar.cn/userfiles/file/20210813081531248354238.pdf
    • http://dogoxuavanay.vn/uploads/files/japojedawulajatulow.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/81782913052.pdf
    • http://www.amedna.com/userfiles/files/bebinasime.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/sgkgm1bteof2togvsle6sjn3t4/49211425936.pdf
    • http://4bx.pl/public/file/18577203979.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gtm9cdjpqctp32btkrlt731dc0/35059933228.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lvkl77j7tu85eqvpl9sq6ct912/tegizuni.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/095becc45592a813b67627448c1e005f/94291165865.pdf
    • https://euroroma-bg.org/files/file/39722132862.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1031b1c809---daged.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb87eb818d---fadedudutaxo.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda813f1d85---50966176546.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e77e6995---dupusudipixikigave.pdf
    • https://harrisitalia.it/uploads/file/xizudarizaxuwivipuli.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb43637984a---70488165956.pdf
    • http://7onseventh.org/clients/868256/File/xipozodetisamupon.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c2bfc1eeb---lebaxewerumezoz.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/8e16e0f19532019802f0041514788ef2/gevesalim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c6.bin
7ec9c0e2001e403b728d2fd587ed3b40d28064f0af6bb46994fdca5549075d7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 10936 bytes
font_01_sfnt_off000102cf.bin
fa35799e375fd4f51187d2fa86f2aca577bfbefe0a2497732ad3a4873842f3f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 16936 bytes
font_02_sfnt_off00012f2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2F 16792 bytes