Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68685da704cbbf3…

MALICIOUS

PDF

80.0 KB Created: 2021-07-08 06:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cbd7140d165264883e7c47f5729612c SHA-1: f0122179149bf9d43659b0ed9c0521f6bf1cf5e3 SHA-256: c68685da704cbbf3892b496bbbe8d742a0d1963e0eaf3e07a48a2db70f6a461f
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, identifying it as a phishing trojan. It functions as a link farm, directing users to numerous URLs hosted on compromised CMS upload directories, likely to distribute further malicious content or phish for credentials. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3e721e52---mawoziwu.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/kmirn9jjihfpe3khkblen6gfqn/97849715707.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072adc42e904---4067192937.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/aa4859c8fb5164b8bb6c80c64e3971cd/63385651541.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a8ad69b885fdc6973f007ecb5c2330b1/rimad.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b59e2c87c9---filodifowizegozeteporo.pdf
    • http://ankurgroups.com/userfiles/file/rizijaxivojigarovadalube.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085d6b98f56a---43120607301.pdf
    • https://247hvac.ca/fabulous1/uploads/files/95554537319.pdf
    • https://atlastoursntravels.com/userfiles/file/93591608393.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/db38afdb2764aeae6c3aa4156b201f02/wuwitapolejetolaxux.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9f56375d1---38662647452.pdf
    • http://randalljroutson.com/clients/44711/File/3960538575.pdf
    • http://guchenes.com/d/files/puwuvafugejeraz.pdf
    • http://cementfeet.com/userfiles/file/156602142.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c38f25f543f66400d6597835a4263c39/zubufovesemubunaje.pdf
    • https://youkuvpn.com/upload/files/90809606288.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c061ac42f0a5162a9a358fa396335373/soxal.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091194c9bb4e---12102735212.pdf
    • http://www.jindatunnel.com/up_files/file/23155390420.pdf
    • http://fantasymusic.it/userfiles/files/68911723591.pdf
    • https://amblamy.ee/upload/file/8884712236.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086752eeb4e8---luwofurebi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=word+problems+on+matrices+class+12
    • 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_off0000d459.bin
2ab04c4a7f1f59898b7076273222297a544e7a87ffcc9d067d45ce2d549685c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 10980 bytes
font_01_sfnt_off0000edaf.bin
1979de1857df77059be1b6a4faa2f85d5f8d1794f8b1a6d9cc58bb00dafa790c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 16984 bytes
font_02_sfnt_off00011a91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 16792 bytes