Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe6097c3b0b8b1d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 14:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 202ca53f79d4e85b4e4ad88b7bb2608e SHA-1: fca0fdbf9b5fa4bc6be0e65794beec7f2e6de10b SHA-256: 8fe6097c3b0b8b1d20e8c2d5167c8e346e0f87cd320a474a5ac5e5d3d0b6621c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The PDF structure itself does not contain readable content, but the presence of numerous external URIs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=abba+mamma+mia+sheet+music+pdf
    • https://senhewood.com/d/files/1195396714.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/3k43lilmo7s9k360f131gt0gj2/14128666399.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/4275f2415cb559ff802d7379a512b3b9/72715718466.pdf
    • https://kaowei.tw/image/files/20210822_065907.pdf
    • https://ccskin.com/geektic/files/85625845836.pdf
    • http://volkshilfe-vlbg.at/images/content/files/golamonakomobosumelimep.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/jakejud.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608769b975260---6037136256.pdf
    • http://educasters.co/ckfinder/userfiles/files/litujun.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/58038076194.pdf
    • https://aptitudeclass.com/ckfinder/userfiles/files/30798092062.pdf
    • http://vandientuchinhhang.com/upload/files/rawejezigavoludanema.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc5063b3ea1b051c58cd18bc24d46622/bijawarudutifegexabu.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b9f1b936d---78099009120.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/kdu9me159mdc56v1ruq2mg5ul5/zesipifonetif.pdf
    • http://ascensionchina.com/userfiles/file/pamaxezorafatofijeluvere.pdf
    • http://benetalent.com/upload/files/xubapalevibovod.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_off0000c603.bin
a599f837233cf323f8afcdd9b3cc3d4871b15d19c7ed4c36dfd59a71db31d1ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC603 10736 bytes
font_01_sfnt_off0000de8a.bin
545959aae0f6c5916fe22147c53308ea2baebd722705d6b5fa2b504b9f956e42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 17400 bytes
font_02_sfnt_off00010b14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 16792 bytes

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