Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5d59411f261ee3…

MALICIOUS

PDF

83.8 KB Created: 2021-07-17 11:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a233bcb4146841e6850b673f900a681c SHA-1: 7c59b21527c2936796f90b36fa0488554ccd8ae7 SHA-256: 4f5d59411f261ee3daa8df331fed4e46563fc526d7cb051f6c676d399461136f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tuvanthietke13-5.com/webroot/img/files/41467160201.pdf
    • https://duproject.com/uploadEditor/files/nidaberimofufozegizujug.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/81845400545.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a123f5980bc---susisu.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085b277bc7b7---sonezixagasesujewada.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9e64d98ab---13276395536.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3bafa1372474c2bd1c2d3c4531ff57f9/mediri.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f57ab141e8---1823940830.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160760d3189e9c---12529064731.pdf
    • http://reutlinger.pl/userfiles/file/9062414802.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d1d309d7---16736374040.pdf
    • http://dade666.com/userfiles/202107file/2021070922494470554.pdf
    • http://atrsara.ir/resource/files/pezomijidajomubodizikos.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088efdf1e2b8---89668372490.pdf
    • http://emirates-offshore.com/uploads/image/file/60945291575.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a05a22f1d---39368010295.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aaa2ad419---rimowesitizowilega.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/79cbm5snh0f1b8katrju7q3t4e/98558771599.pdf
    • https://alexandrapanayotou.com/web/images/static/file/68200481095.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160709b21887ad---77050277258.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0631ea1a54---fagevokadowidexod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+history+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_off0000e7d6.bin
d4577d1c3217d7da9479e09db05236d6cf43a763b6dd76fa7562b9fbedd8392c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 16568 bytes
font_01_sfnt_off000112c2.bin
34266254dd9e0275e7b2fa523ca67a9310d0f7f8594216d4b9e5074ec5e50b1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 10352 bytes
font_02_sfnt_off00012a16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16792 bytes