Malicious PDF — malware analysis report

Static analysis result for SHA-256 8103184e2180c663…

MALICIOUS

PDF

120.3 KB Created: 2021-09-05 18:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98d93aa55f29c093818a27e0c8935fd3 SHA-1: d5c3970dcafc85f46753a34ddbab731b5810efc3 SHA-256: 8103184e2180c66358cf07a84033424859466ac5ec7aff96526c988c265bd39d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggest a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://philabc.ru/uplcv?utm_term=catalogo+prysmian+2018+pdf PDF link annotation
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb5780efbb---giwovofawovafex.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/ratupobibuwumidapawi.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3d124058d1c9b3370d5133245643aa0f/16648900099.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea5391e529---suruwolilirofemuje.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba46acf28---fepabibizogu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/23625fce8d5af9b193f1979be147fec2/derivokexosatida.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/gadunas.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/juvagakupajuxewinoja.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a245c1af501---sorexijiwukazoxanirilor.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/jaxudotiwane.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/xuxafosabelamuw.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092db8cdaa78---webeval.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/lusival.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/18767541930.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60b4d42ce---69617488716.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/73930607909.pdfIn PDF document text
    • https://altbuket.ru/files/xotus.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/63027296116.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090020587a2c---zukojomomosobalur.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/lofewo.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/bugodoxujalimoxemogutoba.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/jegox.pdfIn PDF document text
    • http://108homed.com/userfiles/files/monibifinufefuserojenaz.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/nedizulefifomu.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/72973204395.pdfIn PDF document text
    • https://incense888.com/uploads/files/202108140047003875.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_off00016a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A8C 11356 bytes
SHA-256: dec77bffa94698d519b540ec69002f559305873cddfab3d89bdc151ec34880fb
font_01_sfnt_off00018533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18533 20684 bytes
SHA-256: 9ae3b97c3aa162580593a95cdaf5dce090fa70cad28012585a5e8f46f16fa4e5
font_02_sfnt_off0001bb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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