Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b175e3c65b23ab…

MALICIOUS

PDF

71.6 KB Created: 2021-10-05 03:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ce40cec6489a6f373e35b7533310b54 SHA-1: 98a8484e498a47612adb93004018a4cb99687bdb SHA-256: a3b175e3c65b23ab690d9a035c2b02a1b1dbb1c5025e98d6c5839a0a49ead421
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure strongly suggest it is part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/uplcv?utm_term=continuity+equation+thermodynamics
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f55c6f11ce---71781410323.pdf
    • http://prasongp.com/file_media/file_image/file/lekuw.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ac909a6fed2c6d25af9fac7dc518b845/nugebud.pdf
    • https://gangnampools.com/contents/files/xofotubu.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b910967750---22155428519.pdf
    • https://hohsingfiber.com/ufiles/files/gotizategolisofu.pdf
    • http://srmtteaparty.com/uploads/files/202109110944152536.pdf
    • http://dep14kirov.ru/userfiles/file/xuluredanazumip.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/38099319380.pdf
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/80846011850.pdf
    • https://landbondcorten.com/attachment/file/183c37fc0970ff8a1f350a93026e0f99.pdf
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/38842974519.pdf
    • https://bdata.vn/upload/files/vopekazemixedaw.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/kekinatodoxabimerepoxi.pdf
    • https://adverto.ee/userfiles/file/fulepowukuraxevopu.pdf
    • https://damiel.eu/userfiles/file/doboxiwizuminepofe.pdf
    • https://odontologosmalca.com/images/userfiles/file/77418431964.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ca42eeec---xakigemozizaduk.pdf
    • http://yucekalipmakina.com/tsrm1/img/userfiles/file/12397340733.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_off0000b73d.bin
0b672ac3a8d3776ea154a8db58a71a66235273d18135956af4d502ec1e5f9490		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB73D 10980 bytes
font_01_sfnt_off0000d071.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 16792 bytes
font_02_sfnt_off0000e883.bin
949159b9946543e0198b9eac29f2618b974fea9adf15a4693ddff836a8b206cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 16028 bytes

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