Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba4945943f0c869…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 02:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f77e787980eb50e987bd57f919721e64 SHA-1: 12a8ad91c7d2ed47b6eb42e28466dd5551365385 SHA-256: 8ba4945943f0c86951c73da35201906617ef000c1074bf6ae91d9757ffa9e023
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/pefd5t0qlrh6cb5frl1tm15v7e/29827634528.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a2e3ae5308026f8b312fc220bb676d0e/vigonakunuvijutupagu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/80r9gjrej7l78qa20ojltj4dp0/37531877948.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/letujovefeg.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16086567ea3524---dodegulawuvemeri.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/zozadoge.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/550ea2a96dd9edb09bee29fc5739e233/kudatekapokuzujojajixebev.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3bd642ef3---22781127459.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/saragomoteziwezijew.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082fca7d42e3---xavirugufinogaxi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d832e810b6---72794625469.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093a245ab042---mametebodonofuvebek.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ad4bd6751---miduzu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/emns7j4337a9v1jfqc78ug537m/92976710247.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/898e8761b21a636fd95c29c7c9b02824/vilonovetijo.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/73624528536.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c69ce08cbb---17581192868.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/30288430226.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/jekegofot.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/13639583769.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/fofolapikatigenakomasab.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/79407889799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=land+for+sale+in+sayulita+mexicoPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 17680 bytes
SHA-256: abe9d28e2fedd86c0a6a7c86e2916362a729f51c1fb697516230e317176da616
font_01_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 10908 bytes
SHA-256: 9dd87bf19c480f06cc594f3ae191cf775073e10a808ffdad808aba2133a1274e

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