Malicious PDF — malware analysis report

Static analysis result for SHA-256 f697b65cc710a244…

MALICIOUS

PDF

90.2 KB Created: 2021-07-29 18:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9239631d7911eccbf388e8b7dada1d24 SHA-1: a4dbc0b54c0265b7ea98b8fd93eee2da5a4ac84e SHA-256: f697b65cc710a244d0e186195beb204589f8101fada0ec6a5c04328563da9035
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8tp6e3lc0r365c3v9etji3efh1/28110444565.pdf In PDF document text
    • https://luminex.pl/upload/file/papewopuvadonenuz.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/16861614929.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d527a1195e7---10918269915.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f04a7617a---85578595880.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b05237ff3---59394520756.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/wetalaronu.pdfIn PDF document text
    • https://birudongker.com/contents//files/64049541930.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/94296536751.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/27234545445.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/22758196219.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ikhhdh2fhcjcaa8v1qqd4o81e4/53937560099.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/25519208363.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/wojisasezufamuwogimikozob.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vegidiw.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb639ec43e---ronenikenekarali.pdfIn PDF document text
    • http://christopherdallo.com/file/84164668093.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/93605780631.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ueeeiadba5vj6tt87fdr46e5mh/vizeriwowofesazogekekasus.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab41daceb14---37925600408.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7649453178963df67fe7d003e01615e7/judodikunaxolaro.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/52315613311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+a+free+bus+pass+for+collegePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 18120 bytes
SHA-256: ec7e70e8817f7c89bdce714273f6bed84c86b011cdd73995eee2d314f0f8bf97
font_02_sfnt_off0001402f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402F 10776 bytes
SHA-256: 1bbda6695ce575bb136a1ad488b88d7d5c872c8bd7343a4a694b00e34510e988

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