Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd45a94e7f987d02…

MALICIOUS

PDF

82.1 KB Created: 2021-07-02 10:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0a6814c7ebf582ee16298f32cb5c203e SHA-1: 0149c8f96f038a41d37c8cc7272503c842af03c2 SHA-256: fd45a94e7f987d027477f5c67546813debf1a20248b5f1aa030a58028451c77f
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm designed to direct users to various external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=kelly+price+as+we+lay+mp3+download PDF link annotation
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/33aa32bcac61b2f709e45b238b2e12ea/sununujuxefexa.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ace075985e05331e72a6dc5223c2619c/jezezarevoke.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/4o388d2lvaucumoplqo0v05ql7/49443383705.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1fdaa6319c4650350f1d5aad7e1ea602/revipimu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/9oub0mtpqq10d3l80oig9bf30k/zovisebiwozutefosutegiti.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/dufedemukovilatelep.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06491ec6a---pesanozenozezirovemebeme.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/nugaweja.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4e89582962f70f98945d1f17fd7bd9b4/26390041509.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b3f757fc---lawelovekelorinovopufo.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/85139786489.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/784f8f4a9ba30a78eef685d56800a0de/zezetufe.pdfIn PDF document text
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/5dfcc808d4f93ddeba562e0320c5a547/21122909290.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6ec337214af19e5e07e179080795a62/92130437937.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a11097866ef---32523615646.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/86434875083.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/f35fa1a1c44f9dc0855465bcf2ea99a5/nexilabotumapud.pdfIn PDF document text
    • https://tsegypt.com/file/67577051231.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/276eb79157e133b378575e08ece420d6/sebifetajeromelikuwukes.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xofabobabedunuxeb.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b81050baec1---xagupigikibo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba17b56a6---vulaleturowexiluwux.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/88136104060.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_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 18364 bytes
SHA-256: aa72e7e1ed9e9f8d9f1609baa6de8cb36d66f7d7901fa89e03eaec8675440a37
font_02_sfnt_off00011fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 10940 bytes
SHA-256: aa758b654ba883d265224cf4be2cfe340fce6a9e7611cfedfe9903dbb8b13790

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