Malicious PDF — malware analysis report

Static analysis result for SHA-256 a662b8475caaa164…

MALICIOUS

PDF

115.2 KB Created: 2021-07-19 03:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c0dfc674be88b7cc90ddbd7d98e10b76 SHA-1: bc8b43eaa7304323c83925b7acb5193c0f06f60b SHA-256: a662b8475caaa1641ee43f2061712a91b89114840ba48e63734049d6aad932c4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rcpjs3bbtg9gc25sq3202l3vof/5914413817.pdf In PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1ab4110e---17268292847.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/zojegig.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c51b934b76d---mipumijozazevofalegegot.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607332b9ce6c5---3631657733.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160893c815bd3a---40605498736.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/645a4fc0576a9ffae56fa21b2ae69499/90685011566.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/ruvidokikim.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vnc1t7q78mk3uhqq22ude3o3kf/xomurunoxesisozemadebomo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/57140aaa7ded8e9681b926db50631cea/sijiwalatokeroxexomi.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/66012642b83bccc34d6b046480ff9f18/meguvalezetarewezugifaz.pdfIn PDF document text
    • http://axwelindia.com/uploads/tipazizofilizef.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/27i31ogd7m1s71nili4jinu662/welojadatuvul.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/351dda08b84284f6fb2e60fa06308fac/relidufikuxademapavagepaz.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/jerag.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aeae3be84---30708275862.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/gisewenufutibixisuj.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/kogozanawezukela.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607302e558d2f---raderimivokeg.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a155af4366c---disememukajakigafixobum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=formula+for+integration+by+substitutionPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001431c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431C 10888 bytes
SHA-256: 33b05d4fde3ec5753ea895458a7dcc51dc4b1f2a201cfe5a198566b6dca4e76f
font_01_sfnt_off00015c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C47 20160 bytes
SHA-256: 5217e47a5d36a3a0d206cf16c55ee44a020379093975953de0ecaa189614cf64
font_02_sfnt_off0001920d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1920D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001aa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA1E 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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