Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc804ba3fae4a858…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 02:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af05a330a7366d565c22da2bb110929e SHA-1: fa5b33e40f4bceeee9a156eb19d907772d7ca99e SHA-256: dc804ba3fae4a8585553bee46c8d6da66077c59266faacc49cee2fb1a0ea9a7c
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4d358e6f---bikavilanenovenezuveto.pdf In PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/42278378441.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/janabuvojogidekinowek.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/5823109473.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/doramukofoto.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/53820891226.pdfIn PDF document text
    • http://sayarbobinaj.com/file/338709385.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba268c9db---konofarog.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/26301212354.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/mamugiwamotemug.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/71876623746.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/pigor.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/rufagiwazagarulal.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109011624102038.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/mevigetazibanagisaxipu.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210901091158298424.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/21176273680.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/forazimetalarelap.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/virurusaxagepe.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d68c413c---87024300172.pdfIn PDF document text
    • http://web5gstore.com/Files/files/44540734906.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613503bb29ada---20956898425.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/dimajimowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=can+you+block+a+website+on+your+phonePDF 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_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 18052 bytes
SHA-256: 41ec0dd32bf20d87aa780548f9958cd22c9c6c38b0b1a232a56c8c5b12e82dcf
font_01_sfnt_off00011ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADE 11036 bytes
SHA-256: 1d82b54735d74c351c4950505976428da677c0587280154954ad0ddc147b3561
font_02_sfnt_off00013469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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