Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b1769358d47264…

MALICIOUS

PDF

150.5 KB Created: 2021-07-20 05:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28d6546712abb27455a4d260e3a94a94 SHA-1: 8e01e33054e5add4c409a610c187ffc410a1b97d SHA-256: 57b1769358d4726496f726f0714ae31840cc478d27f4786db3028c3d90c8cfa9
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. This suggests an attempt to distribute malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://uleshuzataruhaz.hu/files/file/82438505319.pdf
    • http://ekolojikweb.net/upld/userfiles/file/85789928154.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/c44b4f5f5e79aab18eac56227487aa71/mewavovemeser.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34b6ebff7---42423276692.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/7145976478.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/b15u8fv1t9ch9urd1qdtjve158/4519865344.pdf
    • http://asbufestival.com/uploads/FCK_files/file/nepasevidoluvimol.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i0lpoaejimend1cdqn4igs5gh6/zozadujodogum.pdf
    • http://auapp.ch/userfiles/files/6865313924.pdf
    • http://keralabiblesociety.com/fck_uploads/file/86723673018.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a98d49a2e07---nexuwokog.pdf
    • http://memphiscentral1969.com/clients/865565/File/37181179248.pdf
    • http://dgjst.com/upfile/file/66539398029.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608648561a9b6---webekefebirudu.pdf
    • http://dongzzang.com/userfiles/file///temidorazixiwafabuwol.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dfe904c14---janovopotelulenepogobixer.pdf
    • http://win-sonic.com/ck_imgs/files/93342082991.pdf
    • https://cuacuonbentre.com/upload/files/gazovureloro.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55a4933e4---gurud.pdf
    • http://www.contectrade.hu/fckfiles/file/xizutamoxazu.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd41e014e---59692076492.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=another+touch+another+love+i+think+i+love+you+better+now+lyrics
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d1a9.bin
450cf7fcd638e9f2ab9e925b507d09eea9dab3238814c0d384a717d7aaf13e38
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1A9 3356 bytes
font_01_sfnt_off0001df25.bin
360f45a61b899f466e3deef5d05bf5af824bde16f8dcf1d4a0e83d81b4ac2a7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF25 10908 bytes
font_02_sfnt_off0001f86f.bin
8897c458dbe6528c75f059dbbc7dbaaf348624e455453c2cd57bf4432f571bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F86F 24224 bytes
font_03_sfnt_off00023184.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x23184 16792 bytes