PDF malware analysis — malicious · 5065cf8af526c814

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 09:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 052f95ae7a818a15fa2c2d2ae3720175 SHA-1: fef3de9afa9c2aebbc20d536157da628d54d7bb8 SHA-256: 5065cf8af526c814d93527a4e1b1813ec60910c395f86e803fb04c4be176fd6d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm is a common tactic for initial access, often leading to further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=american+football+history+pdf PDF link annotation
- http://sunwisechem.com/Uploadfiles/files/92248268964.pdfIn PDF document text
- http://unseenadventure.com/userfiles/file/suzazurejuvanitogikotis.pdfIn PDF document text
- http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/3583748023.pdfIn PDF document text
- https://pnp-studio.com/fckeditorfiles/file/92959715350.pdfIn PDF document text
- https://prestinieurope.com/userfiles/files/xoponetapimob.pdfIn PDF document text
- http://nuovojob.com/userfiles/files/maxoporun.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/1j8643oa9tf762c3agct4nka91/mogetobezidubiwetova.pdfIn PDF document text
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/51cf22389bb6bb6ea1bd30b5d2ee867b/91798648547.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/7etc1133q7kq3oim27j2hieput/tepinus.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c1be2922b4c---dawaf.pdfIn PDF document text
- http://hugslock.com/app/webroot/img/files/44287695215.pdfIn PDF document text
- http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2807a746bdaf89bb3a95ffae253bd415/83236959666.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e64a649b3---larejezubabemi.pdfIn PDF document text
- https://kasihpaham.com/contents//files/1380602598.pdfIn PDF document text
- http://marta-galan.com/files/varios/file/39448670158.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5efaf7ef39---44383702406.pdfIn PDF document text
- http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/vefukukekenamulebeguno.pdfIn PDF document text
- http://krzysztofmalec.pl/gfx/fck/file/6686328366.pdfIn PDF document text
- https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/fr7i0nn6vjv4la2gbngcb3bkhr/lisotugumikixow.pdfIn PDF document text
- https://mihalex.by/files/files/juzuvolarugogebadolenidir.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/b087ee5f92b8fc6d39cc7811d08878a6/bepolirixumekager.pdfIn PDF document text
- http://elrey-uslugi.ru/media/file/fazajasarelewosesexatiniz.pdfIn PDF document text
- http://pspectr.ru/userfiles/file/zujumipaguwi.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e9d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9D8	18396 bytes
SHA-256: `de146817b8d9291835b30dd53296dfdf9200b2b731ed109c5ecae69edc51c96a`
`font_01_sfnt_off00011922.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11922	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013139.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13139	11120 bytes
SHA-256: `1665cbd5a6cbce6f783f09a8251e55f0122a0d14adff66919b0b3b5d0ecf9e26`

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