Malicious PDF — malware analysis report

Static analysis result for SHA-256 a731e38df291e803…

MALICIOUS

PDF

70.4 KB Created: 2021-09-02 17:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5deae7c4f52b89cf65b45290d2ed3cc5 SHA-1: 50369dd160ca9a55fbc2c6a833e0cd8d3a373beb SHA-256: a731e38df291e8036ef12d997b54c4b017617a7be63af2f555912b77fbeffb4c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it's an image-based document designed to trick users into clicking a link. Numerous URLs are embedded, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used to distribute malicious content or redirect users to phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://brlairport.com/images/file/vozutunat.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4ca01624b53dca0dc51385846a3e9f77/31036211701.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6872df6c10d1f1978f24cb60830c7abe/83148063767.pdf
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/88681899432.pdf
    • http://sosnovgeo.ru/userfiles/file/68324908104.pdf
    • https://tort-art.ru/userfiles/file/fabimoxokarapide.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd40ba22e31---46901244716.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/4dbrq276blt9a13o5eur9qn2mg/genexetifaki.pdf
    • http://gloucesterclassof81.com/clients/23558/File/danitizaze.pdf
    • https://universal4shipping.net/userfiles/file/vutakujaneviraw.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f9412665480---55479417453.pdf
    • https://stillwaiting.org/userfiles/file/nazujujatizuganen.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900de196b59---pipurozefeba.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/91208522308.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c319a8d390---fabagabalirumex.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d24446337---fatomodefabijisaki.pdf
    • https://aprilboya.com/userfiles/file/90216970433.pdf
    • https://pakistanchristiancongress.org/userfiles/file/29314927096.pdf
    • https://fotokeramika.bg/userfiles/file/gokuxifomogumariwetedagal.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/dofisutatozezatasa.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a033c841---lipezanid.pdf
    • http://gospelpour100voix.com/fichiers/newsletter/file/nitalawesolovef.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/a3ukoseo1uc1tbpich86fcerij/14499846950.pdf
    • http://salonorganica.ru/upload/files/57245467627.pdf
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/lazeso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=spelling+worksheets+for+5th+grade+printable
    • 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_off0000b609.bin
4ce8f03398f9c02eaee5393bb78c9b7cf809d14ca224852c107148eeb39abc26
pdf-font-stream PDF embedded font (sfnt) at offset 0xB609 14364 bytes
font_01_sfnt_off0000d994.bin
a453e85142be8bba4bc06e558a087b89bb2cd4b1fa9e8bde0186c41e5cd3bbb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 11304 bytes
font_02_sfnt_off0000f3be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 16792 bytes