Malicious PDF — malware analysis report

Static analysis result for SHA-256 b208bb9f554115c2…

MALICIOUS

PDF

69.9 KB Created: 2021-09-11 04:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 32220193e49373821fbd27627cc26317 SHA-1: dd9b8d227f051bece332f020ad2e9ae22fbd33ac SHA-256: b208bb9f554115c2b026c87f10348b52a90b982e3c7e5a4e26594b81d172de52
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of a URL with a 'utm_term' parameter further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=vortex+premium+apk+download PDF link annotation
    • http://land89.com/ckupload/files/95706292627.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/puzolugamivuwot.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/xogakujeseturabotevi.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce5cefdcd---42893782350.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/bonukesovuwow.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210901232201.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/66802455012.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161398060807ae---9253848533.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/gogurejot.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/57a9af38da504e15482840ed1579a268/15840773522.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/linizogikokenaxutaza.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/sezatatunajuv.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/suziforegoguzumasazog.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d9232f4b---91178837471.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/fetiwovogupuvorozo.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/nusurewamibak.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/xabuwedo.pdfIn PDF document text
    • https://kawanmto.net/contents/files/28158907606.pdfIn PDF document text
    • https://actorconseil.com/files/file/81250748220.pdfIn PDF document text
    • https://etadelloro.it/images/file/doxomipabojopekuk.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/pofubepazobijowov.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ac88f428---69556051986.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/19273363567.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_off0000af6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6B 10736 bytes
SHA-256: b7dde6d268a338f27ee5911d1cf9502e4a67619bec38d4920c900715eccbe548
font_01_sfnt_off0000c819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 16740 bytes
SHA-256: 9581181f5cf164eb0190073beb56daf5ec378b3140ff2f4ba9a6dbe764ea75f5