Malicious PDF — malware analysis report

Static analysis result for SHA-256 4151f190026d408f…

MALICIOUS

PDF

88.0 KB Created: 2021-07-17 00:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c43dfbc82f596b816624a11f00b0b4d5 SHA-1: 5c4bf7b73360332ccc0971c571afc015ef2c33b8 SHA-256: 4151f190026d408f85badea91b2592e76e951e9312620afe7b3ca7a34e8326da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and the compromised CMS upload link farm suggest the document is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gaziogluenerji.com/images_upload/files/misakagiwatifakenur.pdf In PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/nibutafa.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/foxumotigobesuk.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3o4ek3pq170moo6upldo2f3bc5/navalatudekapebevajifu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6977eb5ade44f26bf54b7b9cd2250cb5/11879647035.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d60ae3103---89265128497.pdfIn PDF document text
    • https://alutat.com/data/file/18855373495.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/puduwinakikazilonoma.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/26168184314.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/32511323262.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c384ca2d129---vamezagaku.pdfIn PDF document text
    • https://seerupit.dk/assens/file/sisutafireguw.pdfIn PDF document text
    • https://motiv8workout.com/up/files/jamuzej.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-13/20210513155754206908.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/62447941013.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nigedobo.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983133d28ff---zilejudimokosusaxobot.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c864d4e0fb72a5f674d459d59d211fa7/35641859938.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2537b37e---42741816089.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5d2c13303eff609465a42a2ef5adddf3/rukodiwabo.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/99898400255.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/3497643075.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/xuleweguvidisab.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1nbk1s35gea0ke5uuef175cbe2/90720290516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pw+share+pricePDF 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_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10192 bytes
SHA-256: 152806feafc6128738646ab9a6ca7039ba0ae687e7c9ecf2696e995ae2560f3e
font_01_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 18328 bytes
SHA-256: 2a20861f2f9cdc96ac572c39107a2e4f2fa41767af5d13c4c7f02de05f0bc3fc
font_02_sfnt_off0001398f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1