Malicious PDF — malware analysis report

Static analysis result for SHA-256 1355036056326775…

MALICIOUS

PDF

97.5 KB Created: 2021-06-25 12:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72290209c1d571952d54830c316e5102 SHA-1: 68f61fd50fd0ac23cc2efec13f5662ba62520f83 SHA-256: 1355036056326775e717b00e9f3e2245ad22c5c1cdf405cda61ef535b3076cc0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to phishing pages or download further malicious content.

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://drafthe.ru/uplcv?utm_term=phrasal+verb+get+by+meaning
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b28777e50d9a565f045cf69062f18173/65779291612.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cb87b6eec---lemiranunug.pdf
    • http://licausi.it/userfiles/files/tapuninir.pdf
    • http://feynburg-uhren.de/uploads/razebaz.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e6330fe8---88762298512.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/57f683c9f66b07a4f036abd51c4d93d7/45571728714.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/q1q55hce9e9ih06kc9vpkop1vd/nidogejugepew.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1d386c52---30920376109.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4111cb017---damofiw.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/6771179838.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/14f992ccd41902e0e78d28f89507be3c/lokusawilare.pdf
    • https://gamaconsultores.cl/upload/file/96361852867.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a44411e077a---45731968021.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a327015281---50294750211.pdf
    • http://businessvaluationapp.com//fck_files/file/44703109526.pdf
    • 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_off00010c6e.bin
8e7b2e4fde946cd82910c6b34f4dbf56f274768b2236e5ceeaf65876b391588e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6E 28692 bytes
font_01_sfnt_off00014730.bin
8690735972cace58e73229c819cf84dcbc61001270910a25eba1f14bafaa0ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14730 10756 bytes
font_02_sfnt_off00015fc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC7 16792 bytes

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