Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3732ca7900b7f8e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-17 04:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 559735c3745ffea59f8b36da6502fc14 SHA-1: 00d0d7297a98de6958e232bd6ad69b0e628deeb8 SHA-256: a3732ca7900b7f8eaaebe9f4f73dfe510a480e287a2c7608d14e49046754bc3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161351ca1e79d9---fokezivavazajiwo.pdf
    • https://fetogram.ir/images/upload/files/53324504698.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/29331401860.pdf
    • http://tinavaron.com/ckfinder/userfiles/files/lenasup.pdf
    • http://centromp.it/userfiles/files/98882401584.pdf
    • https://khambenhxahoi115.com/images/files/35167778766.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fd4c7934a7bf55dd00aa3567d33abcea/35603224937.pdf
    • http://tv-sat.cz/userfiles/file/tetelotijibop.pdf
    • https://rtquery.reitoken.org/Coaching123/images/files/93140440291.pdf
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/xujavelepoj.pdf
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/noxisisutew.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/07fae8e64971e4b44a2ee15ff9c00c08/83086629464.pdf
    • http://haihengpharm.com/upload/files/dujezunuguzetog.pdf
    • http://learnersdigest.org/userfiles/file/75019485474.pdf
    • http://telesson.net/_UploadFile/Images/file/84655544169.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/podakewilowefolovin.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/mutipepekerukemu.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d564b689315e864d3d6f5c84166bc528/62322045278.pdf
    • http://kastely-vacduka.hu/fileok/file/mulegeroxudiwetapujef.pdf
    • http://www.tahi.hu/ckfinder/userfiles/files/nalorav.pdf
    • http://chuanghuilaw.com/filespath/files/20210917021750.pdf
    • http://sakesushilakehavasu.com/uploads/files/rirogov.pdf
    • http://2sisaccount.com/userfiles/files/mutudanifusalijukowi.pdf
    • https://nguyenhungstone.com/uploads/image/files/nadosuwekakaja.pdf
    • http://squash-fitness.cz/userfiles/file/lamaledimuzebijakexa.pdf
    • http://kiiga.ru/userfiles/file/xasibuzeranoxi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+android+app+for+recovering+deleted+photos
    • 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_off0000c335.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC335 16792 bytes
font_01_sfnt_off0000db4c.bin
d27aeb5c196dae79d1e7a240d4c948d1b1da9515c57cb2e662ffbb18c5dc6975
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 11016 bytes
font_02_sfnt_off0000f4b0.bin
2680210485c80f12d96340eadde38d9d2a6e6b0e8cd8c4df5fb478567842c317
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 16832 bytes