Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cd6e122edfa5f8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 18:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7972351ecb649bd4e41605cc86dadeda SHA-1: 5d414b23be8b41d6cedf54966811d63fd7657bb7 SHA-256: c6cd6e122edfa5f838e9b2ff92d13eb12d5feb9c814fd61c95be69cc4e1708fc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.bussmann-tiefbau.de/ckfinder/userfiles/files/buluwojekeru.pdf In PDF document text
    • http://studiozoppini.com/userfiles/files/95603441438.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/xodonoderepunobajixixami.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/wawasigakuzofidurofulinax.pdfIn PDF document text
    • http://maksimetall.ru/files/73555019220.pdfIn PDF document text
    • http://knipia.com/userfiles/file/61232627374.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/30163470499.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/nibozaxed.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/42980539202.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109050433041144.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb24bc1601---seretasopa.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/6327348925.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131192727eda---23403095594.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/37844296795.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/mumofovugutugatig.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0dd537c32---tupam.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910171808.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210909185145_gpbdj6.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/57680526357.pdfIn PDF document text
    • http://elskenecologie.nl/files/65445032767.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/45567454082.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/81951666933.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/joxitewerozujazabumijej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+take+off+a+snapchat+filter+from+a+picturePDF 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_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 11016 bytes
SHA-256: 1bd04e1e95ed4fcfe193be25bc749caa7567c6bb43ed727228b8ff40f871357d
font_01_sfnt_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 17644 bytes
SHA-256: f7e9b0e583416d5279000686806ebbacfec29e877e239c59a17d4d946faf221c
font_02_sfnt_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1