Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9dace855f27452…

MALICIOUS

PDF

58.9 KB Created: 2021-06-24 23:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96c7f0e82f73e6bdc59709410fea2f67 SHA-1: 19264665ce7ebb991f42e8fd5060b648dd2a68c2 SHA-256: 1b9dace855f27452bfe8d00b55304050f19a18db1ca28b661e08347eb992e03f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://combrooncom.com/contents//files/53593632128.pdf
    • https://vmwarts.com/ecovic/file/55704723831.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hs1k77g85k6emaiiajj3jqg9k1/regeremos.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/g3er5b6ndtedes2am60ub7tjpp/mulufanadufab.pdf
    • http://bnblspecialities.com/userfiles/files/40173247772.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0df683b71---45347133226.pdf
    • http://aaaexpressac.com/userfiles/file/3503077525.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aaed166945d---7787197885.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d957966ef12528f97264f60a64f4d198/kimiwixijewinizibes.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e10e7a3bb---21967547671.pdf
    • http://jinanxintiandi.com/userfiles/files/fovepadiwovavonovata.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/it93mkani1gikibdto0s0u3sv3/25255610146.pdf
    • https://ooo-kenk.ru/userfiles/file/91399616963.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3fb2d0ce1e8963e01b282abfcc7a36dc/93505923533.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=education+for+kagisano+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acdd.bin
7e61c3ad1cd52edd0e638dff96581375093d85bbcd12c5b7377c6c1d3d795799		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACDD 5312 bytes
font_01_sfnt_off0000bf08.bin
0675e21ba3f86e70252b3e7f1186304b4d02d06e36646c7010688d412174518b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 9416 bytes

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