Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c62a38996b9706…

MALICIOUS

PDF

86.4 KB Created: 2021-09-10 16:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dffa1607276afd1be99f45c76ad2868f SHA-1: cbae3ebc3bee8ab601889400f198f432767f496f SHA-256: 21c62a38996b9706414502f68abe727b0c9c4260e01a7de4d58a007aa7c949d8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://astprom.ru/sites/default/files/file/95064778061.pdf In PDF document text
    • https://terracell.info/images/file/ruvufisokozupazixod.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/kabasigitelika.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/76063327848.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/20078222012.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139d12cf3750---bemulasanuk.pdfIn PDF document text
    • http://ombs.ru/uploads/files/39863685430.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/pabosojibemitugeguz.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/69024376493.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/ravituvupasejalabo.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/xaxuragisiluwebajate.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/85252508082.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/6197022763.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161347f8d08854---78738654032.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/42130796025.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16136dbaee3c7c---16509003994.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/felisegexajarev.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/zuwonobepakizelemuse.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/55273389151.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/tojezeniveno.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0aa1582da---32901315550.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/12530145375.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/39691618205.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/xuximirorevirepem.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/83315332730.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/99629249592.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/77576283260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=faug+is+battle+royale+gamePDF 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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 18356 bytes
SHA-256: cbe67fc5b93375cea3f88312df19b3bd168cb5a5edff2d2a5535ef5551ddf269
font_01_sfnt_off00011add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F4 10680 bytes
SHA-256: f8be81b4e5494ff6839bc3ad3b0209813427fa7be83dfe14d8e6c3adfa4e378f

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