Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b81ae26ff30c553…

MALICIOUS

PDF

76.7 KB Created: 2021-08-29 05:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cef2d4ddf42cb6a3352c41a87c7a060c SHA-1: 357d94ed4f84fbb46aa50fd8e36b98388f95aaae SHA-256: 9b81ae26ff30c553268e9cdc9dbc4d2def5c4cd12e12a8b7f3cb4da3833943b2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristic analysis revealed that the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs, including 'https://coretry.ru/uplcv?utm_term=gastric+ulcer+definition', suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=gastric+ulcer+definition PDF link annotation
    • http://alphanaturehk.com/userfiles/file/zutowumitelenonowav.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/giwepiruwedubefanulodefe.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/11185948236.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/825865be5788db442b5b6f15e110b2bf/9407903521.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609760fe88e7b---35741168312.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/zidifalapuroxifer.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/jireteju.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/56735901397.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161194fd1e773f---korixonuzofukajobup.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/dd22hd4is6kerai1a86ngbghqg/molowafolavovobolow.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fn8onr3hk0rpn1jqmjvh1h0cce/70390657722.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b0a737b43d6c657ee10383261a4f7a6f/71435011706.pdfIn PDF document text
    • http://dges.in/userfiles/file/ledufeg.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/28893844622.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a9a665e9---selemezozirajavekosepapag.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/13548277eddd3f968df61c2d35c294fd/duzolebekivobikonovomuri.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/46008530079.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/fabugejififodewuzujexized.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f80f3dd9e---lovag.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/0ike47a53ceihr0mt8kquuq2o8/98111442865.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/ditinamaguz.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/41107853762.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/xiwemobixopuxezifilobavin.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b10be69e722---vaxenefadejazonubamipiguj.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/zuvadanuv.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_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 10608 bytes
SHA-256: b31a9aeeaae66f87e508dfe73657a9562bf06732e6d543cf876735ab80497125
font_01_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 15988 bytes
SHA-256: 2092fb00fe27b5f52687dea2392139c10fe19ad43b5647175f4af828703ff984
font_02_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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