Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c03b70717cc72ad…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 19:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f3ce6011ca535b13ed69dc0ceea793a SHA-1: 9d9c7fecf942e827d70a9e9b3a351e15e39a9922 SHA-256: 1c03b70717cc72adf43c6128394e969cec15bc3126a89c88212f176d076a785e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to various external domains, some of which are hosted on compromised WordPress sites. The presence of embedded URLs and the PDF's structure suggest it's designed to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

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://irlanc.ru/uplcv?utm_term=cursor+for+android+tv PDF link annotation
    • http://balone.net/_upload/file///gukusuviralegovewu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/gevokufuvavakomufomeka.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/piwas.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/lijijefuladudunoxileguk.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/73150476422.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/6257254001.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/katewumemotadaguxemijab.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/kufukixejixodan.pdfIn PDF document text
    • http://lawngo.net/fckfiles/20337974712.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469ac7735b3---mexufoxisowejogudodijodaf.pdfIn PDF document text
    • http://liyangah.com/Upload/file/56298007158.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/40388105302.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/wazosomigax.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed51a9c373---12745593743.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/93254091653.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/tiwesajefugen.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/19329319943.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba1399556---5695252882.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210901111306.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/35700773156.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/46388559599.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/sudup.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0f8884610---vuzoganalufabizoxabetoja.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/xumivumeguzowejekewezaxo.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_off0000cbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 10368 bytes
SHA-256: 77cd55ceb50908cb89b6c5312754a9c0a10162dfaa6ffcdcb9e589f24807e055
font_02_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 21144 bytes
SHA-256: bcb0315cfee4b2bbdc2bda7529ae18a658c0e552503f0907a21ecc9473db7a74

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