Malicious PDF — malware analysis report

Static analysis result for SHA-256 14045026876bf8ae…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 00:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9ddd2849de7a9c9da1f274f5ea749f5 SHA-1: 834fd122af4c8e7f4c7f1f94c2d84a0cd383e864 SHA-256: 14045026876bf8ae9f39279cd21aa7938e6eb8e4b319b7881e7a95fd5f4c10d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure are consistent with attempts to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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 https://smidgel.ru/uplcv?utm_term=delonghi+air+conditioner+nf90+manual
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd3010512---86775281401.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14423af53a.pdf
    • http://korvet-sp.ru/userfiles/file/4238833596.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a2bced95---96829286404.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca57e85d32873ad3974c8e81202e8870/6967695876.pdf
    • https://gelblighting.com/userfiles/files/budulurosujedokuxupotu.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842bb206644---72627739937.pdf
    • http://fsgzb.com/upfolder/e/files/20210803141511.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3a27f8cc261454eaa93e37f2a41fd154/98927437795.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/caa2daef919125a8b9374cc1c4989770/bexidipizubatufugojoma.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160804b8f8130c---51568260618.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee69afb7d---gojalelo.pdf
    • https://gites-les-bardots.com/userfiles/file/dadulazunu.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc8f44b93---lireluvaxadaxavuwalosizid.pdf
    • http://burmeseburmilla-allevamento.com/userfiles/files/janosizimofufadilimarisax.pdf
    • https://verredistri.fr/xmedia/file/92230971842.pdf
    • http://www.themixchange.com/userfiles/files/jimewutibo.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f320cca758f143a464299232e203f4bc/67933732881.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd5cbd1f0---wipufasot.pdf
    • http://budohurtsa.pl/userfiles/file/32483157348.pdf
    • http://yizhu580.com/ckfinder/userfiles/files/nejozavezibofaki.pdf
    • http://sunjewelsonline.com/userfiles/file/61017451205.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_off0000dd68.bin
dca615c49ea7ec4ce4584e2702fa028823212e51b7cf85da47de3bc61c165f29
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 17128 bytes
font_01_sfnt_off000109df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 16792 bytes
font_02_sfnt_off000121f6.bin
8669ca5d852796050db045fc019ad0270d018743ef63a299b69875f179ea28a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 11148 bytes