Malicious PDF — malware analysis report

Static analysis result for SHA-256 116a3d996be8f7ed…

MALICIOUS

PDF

106.5 KB Created: 2021-08-08 11:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c0c0c446e492142b9751f1076fa3615 SHA-1: 6611e67fdd64efceac58d2bd2a5d8754faf661f4 SHA-256: 116a3d996be8f7ed570c9af77d0b028df423e277366bc45dbb1cef65101eec34
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cardion.dk/gfx/fckimages/file/14245461020.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf517c78d---fuzadobinig.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/055819d516c7204fdd7d8876fec6e2be/19447017086.pdfIn PDF document text
    • http://xsteelstock.com/d/files/nowafekon.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/64997471995.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mrappdegsnajft2e4ml7gcfacv/wopobozevi.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/56254647855.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/32667639693.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/5k5qrudpimtt2vheqs4go4ng68/57821414356.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ai6qf7ridbnrj5evq7qsq69jq6/gakew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1580b17309---17697757939.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a61e70d80---91074391368.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/94810409821.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7re6m1q5427ep954bk5kckfpl4/sezazejelexazexozoduxan.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d848554f995---vebutuvijumu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/7926b6b6295908760bd315e31428802e/84604646465.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/givowuketorobu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ced95260bbfdb584ed4d564d4b343dcb/12551484665.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/fovewebefomuj.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/jobofosivefon.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///vokuzaka.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/80733236129.pdfIn PDF document text
    • http://www.moyekolodin.com/files/rutavu.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/68361862487.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/24322127350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=infinite+jeremy+robinson+wikiPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001526f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526F 10680 bytes
SHA-256: 0e4e21ac164b20fe915522063004bd9e7dcb1fd499686f6259aaab6e76fba644
font_02_sfnt_off00016af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AF6 18716 bytes
SHA-256: 72b4beb340bebcadd81352ae7a3297fd46c3dd99f2b7958610ac65ad94689d86

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