Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a318a8e917b5aa9…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 22:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 230afd6c6d920ed0b0442342d478e2b3 SHA-1: a7d567258312b0cc1620eb9f112263b638da4ebf SHA-256: 4a318a8e917b5aa96fe0cc1ad8c1b57bfe8892b30ed54693a800c24c418ab2ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=instagram+camera+on+android
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630929513/files/3409275547.pdf
    • http://carsonpokebar.com/uploads/files/rixonenejitigejojosekefu.pdf
    • http://jungam21.com/upfiles/file/1631082432.pdf
    • http://gamecoast.by/uploads/files/7333097284.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/60674512767.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143a9898bbc1---48282065137.pdf
    • https://benmoonpharma.com/userfiles/file/652404789.pdf
    • http://avvocatoandreabruschi.it/userfiles/files/41760201304.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377098d1ef9---10858280196.pdf
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/sapifamedopoduvozafaxejos.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210916_498A6C28995629BD.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hn83hft0ejf1oqp141gdcm3lls/kipofizumuzopaw.pdf
    • https://marblobathware.com/app/webroot/img/files/jukimigukagorimoz.pdf
    • http://chinhlytailieuluutru.com/media/ftp/file/96973289356.pdf
    • https://valubil.com/public/uploads/cms_file/cms_files/pulonuvusobuvogilojovawep.pdf
    • http://iccarrentals.com/files/file/relabodavokazejotifupa.pdf
    • http://moyamoya.center/images/hand_uploaded/files/xovolerepesifumenubadufux.pdf
    • https://happyfun.tw/uploads/files/202109081005284355.pdf
    • http://mmsmarin.com/imgimage/file/19680925820.pdf
    • https://kiofruits.com/admin/uploads/files/vefupoxenax.pdf
    • http://awarelaxcentrum.cz/user_files/file/wuvagekojifam.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345a2d29b66---3430937285.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/salunofolapigesavorinev.pdf
    • http://timavoshipsupply.it/userfiles/file/84472379090.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/88758535286.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4C 16792 bytes
font_01_sfnt_off0000d75e.bin
441ace237e662a499b3eb3c007a4225057297fce11e46790c61929d63f1285bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 15160 bytes
font_02_sfnt_off0000fd9a.bin
7ac96ab1f84d28a58b9fa57de130955c25f47bdaa7014a00836ce16cc7fbd21c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 10616 bytes