Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c20cc6aec052c4…

MALICIOUS

PDF

76.9 KB Created: 2021-06-27 10:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b547758d38467e338610ca776c1e025 SHA-1: 66421a1b9475a80ceedea59827f3703f04167264 SHA-256: 94c20cc6aec052c4bef621549a2c3858023600150e05e6daab311caedc863425
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/36615366404.pdf
    • http://cocoal.com/uploads/file/49385005557.pdf
    • http://phantasos.org/userfiles/file/pejalofuvamipulozumepifo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/06b86fscdrug01h0r6rbrdat53/73268062792.pdf
    • https://eminencesolutions.in/resources/userfiles/file/15893370916.pdf
    • http://bright-inter.com/file_media/file_image/file/5141588728.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607610b9de718---fagufudatutakaragej.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b29cffbc794---nojawa.pdf
    • http://dataction.org/demo/dataction/media/45244736986.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b5604673---zesimewurufixatarigur.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/46357063504.pdf
    • https://mfdesign.hu/files/file/giriluripebeboxerixapi.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7fb7a2962---gekakudigoretixe.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7c19b72f---lasekamonabumo.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2e33fe214dd7a91900dcfc181a77ff42/wovulumeguwi.pdf
    • http://parentini.it/userfiles/files/nefobefefagog.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/fnite3tiif03bpmghig0e300mq/78310689.pdf
    • http://www.rotudavid.com/ckfinder/userfiles/files/98918539383.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/74679720910.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a88918333---likekitufifozujugufowisek.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9c4daf6cdbe74bc868cfdb509073e4e0/laxidogeguv.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7c203ddb7011639bcb39ffdb07b3ffc3/rolilenozepawinili.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/pukiruvomavuvobujis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mirror+for+humanity+online+free
    • 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_off0000c9b2.bin
0a85536ae4e8da7a3fec23f3fd407f1e1c224a63b7f166c83caf15fb6681f687
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 10520 bytes
font_01_sfnt_off0000e175.bin
43cf4bcdbf6a0d33c8c5f68b67bb369b61724f5eb4f39fbdcd9fe4259d77a91d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 16836 bytes
font_02_sfnt_off00010c8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 16792 bytes