Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6e2c18a7cbb22f…

MALICIOUS

PDF

167.8 KB Created: 2021-06-25 15:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 10d73e775c781355edb9b3bb27cff5ab SHA-1: 6041e21409289e683e82f472e36dc6117b14a5ec SHA-256: 2f6e2c18a7cbb22f2115d958759352e2a78f358cbe29c26b29074ae18ed36e2a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely serving malicious PDF files. The ML classifier output of 0.998627 further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://dh-cell.com/ckfinder/userfiles/files/xokavami.pdf In PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/909c0b5cb72a86d9d22a11472b60f453/gebatowetiwixidunubetunij.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b36e0eaccdf---leminuminovesakusixifowe.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eed426b0a6---15353251342.pdfIn PDF document text
    • https://slide-bearing.com/d/files/mikan.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-13/20210613195230176407.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1060949cf---megaxitiludifilijavoraba.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59c67836c---70626121561.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e388cbe09---37052921422.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///wewarozakinu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f8887e76d---golipulireli.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04888e2540---vidapifazofemozasuwi.pdfIn PDF document text
    • http://heureka-cz.eu/files/vazewolotuv.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0f978554e2a211aeba001facfd92aac9/seveta.pdfIn PDF document text
    • http://soles2walk.cz/data/file/77974328053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=race+and+health+equityPDF 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_off00023253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23253 10484 bytes
SHA-256: cfd45fb3144e64b784734e1f2c148a859ea50b4a36a9d59a8d8370f76f2638b4
font_01_sfnt_off000249e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000261f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x261F2 18724 bytes
SHA-256: 6925bd97152adc2147a8361f42bef13bc9fdd3ea09cf8b86c66a4728aff18596

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