Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21fcb2f202e69c9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 04:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28a55a258dd76f11c715f6d7b4b95d90 SHA-1: 01b60e522b12bcd5c6fdc891801a451bbea0312c SHA-256: d21fcb2f202e69c920753cc4c7258aa6621b5eeaa2be1441a90a75c26de37454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=magnification+formula+pdf PDF link annotation
    • http://bobas24.pl/Upload/file/wosubipi.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/riwiwepukopapi.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a103873a42e---xopuxo.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/supubef.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/dotuwakoni.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/3244298326.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab4f89b037---rurejolapazubotow.pdfIn PDF document text
    • http://qdjshg.com/files/file/50307506511.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d43b4ec37---zisiledumi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1611826269e72c---63465828301.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0bfe0356f---vanopidulejijuxikeluw.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/leguninawokuligala.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/34414492624.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/3408e5f6403952f4db1d7ae8378ff6d4/tegudovirugotaxusinepu.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/fabusodo.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/26435916782.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dad34a941---powugepaboxizod.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/15871919256.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/45904995412.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b4feeb9a9fb8bfe5212a96acc8a6c20f/jijisala.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6d3f57ef6d0fdf1528887f52c091fe56/32972790191.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/budutekidavuxirasiwe.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/befcee578b6bec4bfa568a9fcdecec0c/nokored.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/4005575204.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/rufebelirisubirefetini.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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 10756 bytes
SHA-256: 25561255649d9daae129aff7f3ff3c746a912e6c945687763e5a9231fa6af50c
font_01_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 18456 bytes
SHA-256: 6e74aeeb4b18ae2ab16e55b8fc0df105243b5d98b1297445dddcbad1287ed6cd

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