Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32677ae86a661f8…

MALICIOUS

PDF

94.4 KB Created: 2021-07-01 23:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07d136374bdb0cfbfc243edfe4141000 SHA-1: c6518cb757e79a3ad7251fa6cd922ac13c01ab76 SHA-256: f32677ae86a661f83cc52e092ef0eb5720fcab1a93b0126949e90800658446fb
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 websites or link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM further support the attack pattern of using compromised or disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tsegypt.com/file/32481330885.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c4b18a1c5c8597fe91ef14c99906de87/23576948956.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/zameretanajudilesipojafif.pdf
    • http://historia-bfured.hu/userfiles/file/loxiresubute.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/kobeteremuzoxonagobad.pdf
    • https://mosconi.net/userfiles/file/piver.pdf
    • http://color-gateway.com/userfiles/file/pasawusugaxixu.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a35b0d7214bfc6c6e13e280a014845c4/pasumemuforirase.pdf
    • http://lab4050.com/upload/editor/file/18881841397.pdf
    • https://ozmutludokum.com/userfiles/file/wilapasek.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/gcrlmusog3ss0q7k68jdm28o5a/65237007338.pdf
    • https://argumentua.com/i/file/62991685915.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8ddef9394aca9d40aed6eb0ef6464ff3/bajidurarizurubigi.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bababb068a3---puzidiremitixor.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/pinegegukutex.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/371d2343d1d1b1832543456e446dd4b9/69345071757.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/of70t8mrtvfhakihk1ss3734ig/86717527041.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86fcd1a03---gagefi.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f42e052b1---judanivinubufasajob.pdf
    • http://blbr365.com/userfiles/file/1622904943.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16094259ab0f0e---58736372874.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9151f1070---xefobo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857cee21593---jabafikozez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=book+under+the+table
    • 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_off00010f10.bin
c8c49432a1a8e02cd44b9946a2284a52ab13e018370bfb5a6fc854385131f217
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 10468 bytes
font_01_sfnt_off000126cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 16792 bytes
font_02_sfnt_off00013ee1.bin
ccb78a39b88fdc712e0d72be6384c516e1a12ba8296edb3d8c4e721a81a1eeaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 17292 bytes