Malicious PDF — malware analysis report

Static analysis result for SHA-256 0621d2a5dd9c16b0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 10:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec4d8c3a0ca839e626a18c5919c38bf4 SHA-1: 43f2e2f6f153fb49f77e90578af17ead668adde6 SHA-256: 0621d2a5dd9c16b040ba63c6ea3a0753665d3f09c96d05ef705682abbf065337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16131acc9f1f5e---nexamegoz.pdf
    • https://takitech.hu/userfiles/file/55142610721.pdf
    • https://sharenkon.com/files/60579347343.pdf
    • http://ldksolar-officialliquidation.com/userfiles/files/kakejuxe.pdf
    • http://deshdunya.com/blogimage/file/74815982850.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/87551795816.pdf
    • http://c-amc.com/upload/files/vuvoboto.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a70df44237---jimidumimimolatobi.pdf
    • http://myoffice2561.sesao33.net/UserFiles/File/66847536164.pdf
    • http://heureka-cz.eu/files/jomaximun.pdf
    • http://skonasystems.com/userfiles/file/tisuvukij.pdf
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/46499331481.pdf
    • https://corpeverest.com/ckfinder/userfiles/files/panijin.pdf
    • http://hanasushipickup.com/uploads/files/milasokajalat.pdf
    • https://matharu.ae/userfiles/file/78993114198.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614197275b8f0---petavametirobepovupof.pdf
    • http://reginahajo.hu/_user/file/nuvilelod.pdf
    • http://tranindo.com/Uploads/userfiles/files/motamuvi.pdf
    • http://robedecreateur.com/img/files/niberid.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b22b553d05---mubofud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=print+screen+android+lenovo
    • 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_off0000e180.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 16792 bytes
font_01_sfnt_off0000f997.bin
e7171d391ef20f3d4ed74e37ad467849b2678d39d2df9ce4d759a644bfd59441		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 10428 bytes
font_02_sfnt_off0001115a.bin
ebb370c3e91bcc97e38ef9c0c69b7e0caa9eca3dc2d2dfbf4c51dfbb806651bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 17648 bytes

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