Malicious PDF — malware analysis report

Static analysis result for SHA-256 855b7e4542dfbab5…

MALICIOUS

PDF

86.7 KB Created: 2021-07-08 04:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a9158384d2b6206b35b4a3bec14ab07b SHA-1: 8abddd3c451dac752bf50402e343d3d773f43dc4 SHA-256: 855b7e4542dfbab50db31aad626e46fd87ce8d703a3001891c04b3ff98748e9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing or malware distribution lure. No scripts were extracted, but the heuristic firings and extensive URL list point to a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=the+ivy+kings+road PDF link annotation
    • http://mdbim.pl/ubezpiecz/obrazy/file/88139246103.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe176abd2---19868419915.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095cda718330---ruxipifopob.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a566d9961---62947252711.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607992d7ea835---vinax.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dda1a1c2ea---45822540932.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/nafawexeva.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/49293364836.pdfIn PDF document text
    • https://paulins.se/anvandarbilder/178/files/wupejob.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/o9819pqqosm6cjiejb4pblu5mm/jawofeniwudebuvov.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/83239802508.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/pidoxenutosezifunejepud.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/bugadenusigoxutasabowolu.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/migalolis.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/gulipepojikoba.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/57876668176.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c485c396060---38974199257.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c343ca41d---gujotexugazelixawo.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/tawusikavoluv.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bac858974d8---81384230677.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/b7d76lg4v4jrijs22kijk3rqq7/15266517201.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a774198e91c---30202496505.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2510060d64c622d1feb360554f3d9314/pogixatifasowumusagamuj.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/pj9ud11oopvouch2g7lkmnllq7/jolavepofovutiv.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_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 17428 bytes
SHA-256: 1beeec0a576bac278a2aa2e0af52ce37a7c3164b885afc954f1927e8ec77d220
font_01_sfnt_off00011c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 10620 bytes
SHA-256: 5433b771ecc5f2de003dcc2d24f016f7106beb36ffab4904b3ee4857f31ddf13
font_02_sfnt_off00013455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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