Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dcad71ebcb2dce…

MALICIOUS

PDF

96.9 KB Created: 2021-06-26 04:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74d69480cbb61a33f959ae70b84deb26 SHA-1: b6e755fe99cf0d1cc54fd254a30622b994f45a21 SHA-256: a4dcad71ebcb2dce5b3d2f3195727584fee02a7eb36e9a7ba15620a4319a7aaa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple links on compromised WordPress sites and disposable hosting suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://pistant.ru/uplcv?utm_term=electrostatic+attraction+meaning
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/72150a8e8d2cf3d9abbda5685f1a61d9/75966131764.pdf
    • https://lawyerupsmart.com/tempimg/file/xixigipukub.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65548c8310---18121954657.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be80faedbe9---sukisusokotivazabakisef.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/78676344471.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef7de8497---vokegomuvuzogelojozegavuf.pdf
    • http://abwcrainhwy.com/uploads/files/kuderekajeditubo.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/5mc8v17eassvi6lfrbpgerl4c5/kelizozojuviparutazovuzo.pdf
    • http://tizianaiberti.it/userfiles/files/surefizepuwipetav.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2743ce359b---rusaf.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/2k957edoi6t44olu65gqbr0g9b/riwusokexaxivuj.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966147d1414---32390319426.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e17132c9---1484733954.pdf
    • https://universal4shipping.net/userfiles/file/89117527801.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a175ef99f42---58626569289.pdf
    • http://cepsagibyachtfuels.com/images/photos/94496134483.pdf
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/7o26ip5f2gftibu46lrn63sblf/76420635937.pdf
    • http://fine-cottage.ru/userfiles/files/bufudibez.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089345b2b915---65365023204.pdf
    • https://sasalidayanisma.org/uploads/file/96441754352.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc1985199---11913897100.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb234851d---65128282350.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084409b9b1ea---73678894225.pdf
    • http://eko-inwest.eu/upload/file/bibanewavo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119d9.bin
467e15498e28b1402a2b89e81ebd29bbf2fddf887cc103f0f715e426d5f4fdd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 10556 bytes
font_01_sfnt_off000131e0.bin
5f9cca0e3fbdbabaef05f98960059645cc1bfb8599662f1fd10e81a4d1da9618		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131E0 17212 bytes
font_02_sfnt_off00015e76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E76 16792 bytes

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