Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da080140240aa78…

MALICIOUS

PDF

73.1 KB Created: 2021-08-31 12:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ae262f486355d022b902ba7873b2b36 SHA-1: 17c64b1f2282a0ab7b38036fc275bdfa7bc49fbe SHA-256: 9da080140240aa7846d430e03cf8afda37aa3e970b1f109d896a4d08f803dbcf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external resources hosted on potentially compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://flagrant-desir.com/userfiles/file/tipotokotegex.pdf
    • https://sapsda.org/SapmaUserfiles/file/97430055525.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mhtvs81sknjl5banp1hmlben04/89390551982.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ce03d06a8---49506520041.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853462be7b5---46008275010.pdf
    • https://at1-turbo-j3t.com/contents//files/papabotaxunaruvu.pdf
    • http://nuestratierrapremios.com/campannas/file/jemusawigipesamob.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5d6ecf02---xojeku.pdf
    • https://ags-car.com/upload/files/xefaboxepudivuwo.pdf
    • http://artin-intranet.com/ckupload/files/megexuxininetomilajid.pdf
    • https://yepsell.com/userfiles/files/78472315544.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afccb2b8857---giruwavebevakulurem.pdf
    • https://bazab.ru/ckfinder/userfiles/files/sibonixijuxedowedabemu.pdf
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/64322270571.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/mpf1hit511i8jl5p2urroeaghj/lepanatewinad.pdf
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/bagenaturap.pdf
    • http://andlupa.com/userfiles/file/gapezogumar.pdf
    • http://artdental.hu/editor_up/totosenevonalopide.pdf
    • http://dream-mebel.com/pic/file/mebexuwofizesosa.pdf
    • http://sxhk365.com/uploads/file///malifinuxi.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ed4b840ff---55350842075.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7bd62f8bf89e8ffcc3f4451ca8ed3c38/38678259677.pdf
    • http://sattamatkapatti.com/userfiles/file/rujiwirosek.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f1cb1b8a48608c6a26f083dbee47824b/55887877957.pdf
    • http://blessingsngo.in/userfiles/files/nurelikusuwisidejano.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=paperstream+capture+troubleshooting
    • 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_off0000bbeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEB 16792 bytes
font_01_sfnt_off0000d402.bin
1ec55bdf928b8bbe2ff901cd602417d6f33c43a274481fd7882132f7ac0f927b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 11060 bytes
font_02_sfnt_off0000ed5b.bin
cc9ee3bbd72518ab1c7128f1938619649fdaa2135f5e7bb30cb205e5010c9b5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 16036 bytes