Malicious PDF — malware analysis report

Static analysis result for SHA-256 17183fcf452d89d1…

MALICIOUS

PDF

95.8 KB Created: 2021-07-22 02:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 590099f4935543aa4ce3eed93b279313 SHA-1: 3c8993912f125589dc14c695cdf22e118c1aa057 SHA-256: 17183fcf452d89d118b867a769dae6089fd369c96300797aeda5f63891c26a6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to multiple compromised WordPress sites, which is a common technique for distributing phishing lures or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users through these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160acc75ed34bd---tufajubuneterozidexasugor.pdf In PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/valotibikedasafowofaji.pdfIn PDF document text
    • http://emeat.ru/var/files/22720042705.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/namap.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/nisajuzusisovisosu.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/mujoburezomeridokusup.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ab6f2d10---zotobajatu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/majebonunegikakiwudalalo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b46a970d---85236940628.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e58aa5c92f7dafeacd40518e5ac0f44e/60266237349.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/wojuxesefelutusag.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/qlkc695ebrlt5b7ififr3ng1vs/dawejofe.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/na446jt83a7a9nn1ftk95sp1cs/51452633075.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/82991679179.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a0ea601392f57602c2665ccedc126fa7/5685520807.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/imv81mcermps6arlulasl89qdu/dejijumoropopi.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/10396345887.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbba9521e6a---4692642235.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/zivinujakenab.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/96903879319.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608818bf4cd8d---vobopunovukiwajid.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af2342874c2b689cd1498dfc3ed9ad37/58589151902.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b394ee80d---kifavavubujukovopile.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861e018b5d1---9435000383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=science+chapter+7+class+8+question+answerPDF 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_off00010de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 18980 bytes
SHA-256: 22c4572aa1f8c013c0e7d6433f3113d885d4c048931ac35d547079883fe51214
font_01_sfnt_off00013e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2C 11136 bytes
SHA-256: 403818b60c6f95e8053d88fa5319c3479af5bf91b78d8bcdc181d14f65342ae0
font_02_sfnt_off00015832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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