Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfce878576e00d1…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 13:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 072c9943e0ff6049a8e7006add7d7c84 SHA-1: 1222376bb7f9574a9d81b057bf3b95e69897b321 SHA-256: 9dfce878576e00d1a578621a77d40e18a5e6d29f4f8b1f602d94d474f97e38c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=cute+love+shayari+image PDF link annotation
    • http://saraswatishikshamandir.com/singhania/downloads/file/papowoboxoxokolu.pdfIn PDF document text
    • https://gencatakan.com/upload/file/wefuvenekabuxebeb.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/86718741822.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/degebejixukum.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137757b32edb---2748687732.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/53soqbc94qag8tsdiip03gd025/nemabex.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/44676828053.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/434i9smqdsudm9o4pkcfis5r23/manivuraruja.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/23281215211.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/30331053777.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/79696976471.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/77003823455.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/pipadoririrafokuxig.pdfIn PDF document text
    • http://inica.org/files/file///80032253351.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/sarere.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/xutejasudolajejopof.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/56627071666.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a40eff2dc79572a030d2fe3a8a221fb5/mibinuw.pdfIn PDF document text
    • https://ibextrail.com/editor-images/paremu.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/sakabivogifeme.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/wezezebagajexikikoneroj.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/wesawidovu.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/mugevepojelo.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/48332930110.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/tomifom.pdfIn PDF document text
    • 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_off0000bf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF22 10760 bytes
SHA-256: 341b654369a1e2d19e226b4c5235923ca8732e3dca5146cddf94e3210b25203a
font_01_sfnt_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 16932 bytes
SHA-256: b654c5df89e0228ab2db977c22fd2e4b5b080ab2af11cf90ff7b4b67ec219a51
font_02_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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