Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a04217c81aba5a9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 03:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 413591a402104e0bbe7d75b49349bbb5 SHA-1: d0b4fd28216d334133fe383394459ed7c7581c14 SHA-256: 6a04217c81aba5a9fc9574406d17a62ede26e741b3ce3bffbf00a42a736ef228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads or disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=vulcanization+of+natural+rubber+pdf PDF link annotation
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/dugadezofuzexilibotugow.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b10e4739e91796efcafe757b89a18edd/xowopefatawule.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/xufov.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/libufuni.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/65421527224.pdfIn PDF document text
    • http://rentaruedas.com/files/others/65460407586.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/64322379338.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/pifosasevebujukisugumasu.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/naxuxufutoledutebu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3t30sflig0gem8nd0a5014fsl7/37177142614.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac625865400---20629090068.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/63708202003.pdfIn PDF document text
    • https://digireg.at/upload/50498169390.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/91742149749.pdfIn PDF document text
    • http://davobio.com/upload/files/21370615855.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/92974971537.pdfIn PDF document text
    • https://onecre.com/images/content/files/17416182121.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/difimus.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121af81202d6---goniwikixenumu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/29652941764.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c521b48dade---26586965735.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/nedelogaxegawokukibi.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/7562492749.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c1d788f966---60260012213.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_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 10716 bytes
SHA-256: dc855e3226e6227f13f55394ffd496927710a75a84ec90d889e434dbca25a5e9
font_02_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 17816 bytes
SHA-256: 47b5cb1045451b5851538a1aff4fbcd723db63fe3ed7c1b2cc5b99ae14f162b3

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