Malicious PDF — malware analysis report

Static analysis result for SHA-256 5852bf0b9899262d…

MALICIOUS

PDF

99.7 KB Created: 2021-06-11 00:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ef5136f375f17f4b812d7db8d71f3713 SHA-1: 26cf54cba5769add727c5066b3490f38093a470b SHA-256: 5852bf0b9899262d587ce4133d16cf4fb5ba4093a1990eef20f57a1c6db06dd4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user curiosity by masquerading as a torrent download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=the+wolf+of+wall+street+dual+audio+torrent PDF link annotation
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/99ac4bdde030314281a1f8816efb708b/46048210135.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/jomezovofowunoj.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/luxabipakopifiz.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/93104036515.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bgc5hk5m81q8thh1g9r2d160k7/15618931287.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7a1c0e96c15580e6631de24b9a2eae1c/30189359786.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/97006183362.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71290f2aef---6202871754.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/s77cs09h58k9dni59tnv6puh4d/85471343258.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/dewipa.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1a1fb891a1b4b6a527fb58c6587b42a8/fiwamizejoruxujoso.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9fe731a6a---78021179896.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739c2be80b7---borakijoro.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160840970d5d31---98914063678.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 6608 bytes
SHA-256: 968a46defcab129c02ee8b3b034876d43656a7580cad4147fefc427ed1bd60dc
font_01_sfnt_off000113c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 4472 bytes
SHA-256: a5c37a177ef55c25e330f635329d4c33e3b4bbe7c0ee4150e0702a3aca789187
font_02_sfnt_off00012340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 5036 bytes
SHA-256: 6639e8bc12e4d2c1e0341c83e9d947bfb2635fd6fe806013c0d1c88648025464
font_03_sfnt_off0001346d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346D 12604 bytes
SHA-256: 664937e6559e572c86cc2347e7a768bc2e3f87f41778b6c873864a138bc33ded
font_04_sfnt_off00015e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E38 16300 bytes
SHA-256: afa995f0432d46de0334afa579ebb7f09cd585a456b987d717e85a39ce8c0766
font_05_sfnt_off00017426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17426 2540 bytes
SHA-256: d0d232390e603eeb4bf985ad69388ecd8b33941601542d4b8e8ae2bd13b4a273

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