Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18cce4543a27997…

MALICIOUS

PDF

86.5 KB Created: 2021-07-05 05:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e300b3d6b97dbf5b4db62780b7d6dc13 SHA-1: a29c16225fd9f9007d2af59a38f60f925ea192a3 SHA-256: a18cce4543a279970a7d9d48585e52acbd030998c483f715b505e90a9c1880e6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites and disposable hosting, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs suggest the primary goal is to redirect the user to malicious content.

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 http://diysmart.net/userfiles/file/dekomiju.pdf
    • https://aravlicraft.com/cmsCart//upload/file/11014499768.pdf
    • https://finatwork.com/userfiles/file/lolobewibuwif.pdf
    • http://soft-pro.hr/upload/datoteke/zupususinaxuzutera.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6103e412a3fe3cf7baed42841a2a453a/duwegepabadi.pdf
    • https://eseninternational.com/uploads/files/55001036396.pdf
    • http://amandamaitland.com/images/file/17349282838.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d814cdcdb8---65750498830.pdf
    • http://makesomenoise.hu/upload/file/jesufupuvurogemizagubix.pdf
    • http://sushiosushi.com/uploads/files/rudujepijitobopinenurokis.pdf
    • http://klpa.net/userData/board/file/luwiniluvelu.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d120b0c8c0133ae0692562ac6228af9c/94857786137.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/b3e315u4gutkcjoi1gkoijjh0g/melarowenewiwo.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c712dee6ff0---19917017086.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/b2ihq0q7d7semp9g77fknv2394/gojijizesumek.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/93906121698.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/wipevijebadu.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a12e7e18ac8---nixasarutafozove.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f56283a9c---sokaluwaxokekemikowano.pdf
    • http://nadiadsa.org/userfiles/file/xesixibar.pdf
    • http://www.elstar.ru/uploads/files/gajedeboratozezi.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076ceed1097e---nozit.pdf
    • http://wernitznigg.at/files/gakafemajedasojalefe.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6dcb6994ecb78d3768fc0403d4762b64/39044358535.pdf
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/salosape.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sample+meet+and+confer+letter
    • 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_off0000ec73.bin
1ef5deae7566fb2d0da91f4eadba3a58dd6e227cfa6cd2cf9b81f91c22ebd884
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 10596 bytes
font_01_sfnt_off0001049c.bin
990d357890131424b8764cb9965e31e4a1cdc0c399c47239ce07788a01e3d27a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 17752 bytes
font_02_sfnt_off00013342.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13342 16792 bytes