Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fd0b2126b42227…

MALICIOUS

PDF

90.8 KB Created: 2021-06-27 17:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c5b78b8fc92dcd31800e97fcab149fb SHA-1: 62a7f75d2bc4b5f606aae04ece6c78acb74673fc SHA-256: 85fd0b2126b42227925476e0cda64de662e7d8ded2a7bc016bb341d73f542c6b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844eb120806---7325632084.pdf
    • http://phoiinnhiet.com/images/uploads/files/vuzulazoniruxalevujatiw.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ae81caa0e---24902076283.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b552bdfd8---57219478393.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607255304ebc8---76537004967.pdf
    • http://interiorconsignments.com/media/file/zegorifolusigesunog.pdf
    • https://foundryindia.org/userfiles/file/21400556674.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160783a15da165---92159668133.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c44260197e315ae89ba211a261cab9a5/30779501440.pdf
    • http://maslag.eu/userfiles/file/68620127515.pdf
    • https://beltamas.by/content/Files/60538855042.pdf
    • https://amursvoidom.ru/media/files/risubapagi.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hfsnk11i4cq4he0e8ak4cnmsk9/nimigujatajosotesurimeniw.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c9521b351---duledafurowov.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/78016006344.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/441ff226d86f17c23e05df80ab34f356/51843682146.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ffc44de46---tajerizomibabotipoji.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3391e13d7e---99554679418.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ab93987---41563054865.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lidar+and+archaeology
    • 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_off00010188.bin
85e66638e8489af68b2da4ff09f0e102bf826faaa51aed8de3da0f94ff030202
pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 10452 bytes
font_01_sfnt_off000118e6.bin
aefce5399bfbf949ec0d32a062d2e59aae88bcddcd2672112bdfac828448fc5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E6 17720 bytes
font_02_sfnt_off00014615.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14615 16792 bytes