Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33be391e4e8a36a…

MALICIOUS

PDF

76.0 KB Created: 2021-07-01 22:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 272016e65de2da9a54fec3ab7327ab45 SHA-1: 33fc3bf516eca5110d27ad44488efe22f9f4537d SHA-256: d33be391e4e8a36a19297cbc0a7a89d0879779b85865008432f90a8bfdebd873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=big+data+science+projects PDF link annotation
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f51528abc42981f3b10428909a3dbd37/tinitugodadopawetuti.pdfIn PDF document text
    • http://clubchic.lv/c/i/files/bimajadafelebot.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7c7b314fce0032e707ff786084462b42/31912674126.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/76520999658.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6c28e98c---20987760749.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/34188f857f3551cb019424d1024334a4/mobulanudimoronebajen.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e79215944e---nesiworidabukelufexozoxog.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb9154f26---41657635773.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f61098e879481afe66c8092808920065/3396576395.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16070d3ae38b3e---99262291341.pdfIn PDF document text
    • https://koratspring.com/upload/file/sejuxawowife.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/mebajifuvutekewaten.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/vuberapezorozogageneraro.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/38329419505.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/lusaragez.pdfIn PDF document text
    • http://446888.top/userfiles/file/jakizorigafupefufab.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609633c176650---4585712956.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b91838a09aa---60857367713.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/r0m9g559toqaf9djjj56op5ouq/kuxigikus.pdfIn PDF document text
    • https://ancoraeducacion.com/images/bulerikadufik.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/24e20f3ee46994a336c7cb1fde590383/95970470973.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7dfce75099b870257ce2af2891c31d67/munesun.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f8f4ca65be65d5fd9d1fc694b318ac21/41344228890.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/87912715587.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_off0000c38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38B 10828 bytes
SHA-256: f348c4d280cd69eb6e4a02c06ea8f1f1491beb72175627f811ee6e301f4fea3e
font_01_sfnt_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 17460 bytes
SHA-256: 4314814381c9f85ab365c340a6699127133ef018e444f7e7d73e1cfea3e1fb12
font_02_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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