Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90b070fb14f97bd…

MALICIOUS

PDF

92.5 KB Created: 2021-09-01 00:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d623ea293e010a65e7bda25d084fd3e SHA-1: 91d87a3bc03ca72faf95522d7dac137c3e5de58b SHA-256: b90b070fb14f97bd5797e69f53dad6246b1efe8f12f2bc2a3cf172469ecb26bb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. It contains a link farm directing users to multiple URLs, many hosted on compromised CMS uploads and disposable domains, which is a common tactic for distributing malicious content or leading users to phishing sites. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://duonglaohanoi.com/userfiles/file/84994294296.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/v610ia6roocta3apibni47th9e/bipara.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaba60b443---87305297980.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/b114bb60c248bec8d2719beb6523a513/85218793996.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/wisafigejovizojisajasis.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/revis.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/cabbb11a82c666f6cc0ad9ff1573b106/tabekiwo.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f9523f31cacbab33cf5cb82091eb128e/46374659310.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/5913e778198e645b615b1c16e944d69a/zaxopevevilegiv.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1d3db0c978662c1a4a6c829553c4045f/jirat.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608260c61ec16---zisox.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/aa0a35c05a57c85193cd8d0cd446c2ab/jedekuxijigebikekezidugiz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/967e9683b6bfa64f1c4fa4ead0f6402e/77727566575.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe49833e29---xekanuxizubenibepuretov.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/lanokipakomalozefemefuz.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/67226981554.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160713ff874859---20034498171.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ea7d1bb9c---xitiwikajuzaser.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/92268133815.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/110911149978.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3598ca26---12545365645.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609099c14c273---pelew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kelvin+planck+and+clausius+statement+and+their+equivalencePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 17808 bytes
SHA-256: d6accd8bd65fe4bc9312ce2350a40bd93d00be212f02979291cf00cbdbf5fb67
font_01_sfnt_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 11056 bytes
SHA-256: 40126a25360515952fff7e43074b4f867bf8ec1c2e9db161d31930ccbd233411
font_02_sfnt_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 18460 bytes
SHA-256: fcff71724a561532230f805b9e17ccbd555a4faf1145a1d9eb1c5b5909f6b08d
font_03_sfnt_off00014b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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