Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec6f6cf1b1bbb84…

MALICIOUS

PDF

82.7 KB Created: 2021-06-28 23:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 193931e470aed5f89207536809ca2c2d SHA-1: ad9eb045f02c52b1588cf045ec4ef8ab0f19eb9b SHA-256: 5ec6f6cf1b1bbb846f8053cd69b55d379e430643c776a847e0dee76c8196695a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/a22c115fc7c80694fad16407959bb84b/40449266480.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f4b1f6cdda55868a80d624f5a7d2ebb1/zivamofipawomoramidu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5dafbaa6ae2758d8978eb622ef9d958e/lawejizazego.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/7777790155.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/3502219135.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7d125fa4---xijemudokofujigomadeko.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8004f9a07742cc0cf4756762be0c2dbd/xitatajir.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/abf73aa103503e61b1f8f1749cacbd0f/66993207400.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/79247144037.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/597ecaf02061d9d5f7873a45dcd26032/doduderavebabu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160836e07a1c5b---luzigu.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9nhg6j9ildcqiv9etmmsc8o6ov/xobizajuzisixogivipoxofaz.pdfIn PDF document text
    • https://argumentua.com/i/file/16540332613.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/rujuwasatafuzi.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/52128313029.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070956a9c576---72107983711.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/jowuvibona.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/xemaguxuxuzufanolidepav.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70cf6d9744---89196849706.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/vogikigiw.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/81093129016.pdfIn PDF document text
    • http://deltools.com/userfiles/file/jadowotilow.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/112055528655c06bff51b3fb60e64914/28111674694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=karel+challenges+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 10276 bytes
SHA-256: 14682bccfb227057a4a6fc69e670ed5b0a7e486c37b9ec1858f4de734f66c9ff
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 18488 bytes
SHA-256: 8d90b9f924048abb1179f94131ca7c6de1fb629bd919c6297f1228b3a472ce02

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