PDF malware analysis — malicious · 7f26acc86877154c

MALICIOUS

PDF

75.5 KB Created: 2021-08-05 00:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 926ec5cc6781c472a317071ab66281b2 SHA-1: 61fa6f5f8d01d9778adc5d1485d359c7dbdc4e01 SHA-256: 7f26acc86877154c2c22c385004fec400f76cc6fa20ade97ebe368be712b716f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm, suggesting it directs users to compromised websites or phishing pages. The presence of multiple links on disposable hosting further supports a malicious purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://chcial.ru/uplcv?utm_term=how+does+the+surface+arc+mouse+work PDF link annotation
- https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/63aa1f42107c45eb2386492d47f82cb5/97893092591.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a177ca19f---pamebawino.pdfIn PDF document text
- https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/576dfb239d59afe27984be46d422ebd9/88305958797.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608857c690923---kevosadexese.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3a879b80ff60323377931a44d3fb4019/88421823056.pdfIn PDF document text
- http://veoguidecostarica.com/ci/userfiles/files/40016896095.pdfIn PDF document text
- https://eltonltd.ru/sites/default/files/uploads/fesujogufewepezarobin.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2de4776ff---29006835949.pdfIn PDF document text
- https://bleikss.com/userfiles/file/dojopajojaf.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/7951cb7527e3557c1781b13f81f28a9a/sujajagesoxomidaxo.pdfIn PDF document text
- http://aceonlinementors.com/userfiles/file/44783936859.pdfIn PDF document text
- http://htwy.com/upload/file/21763094284.pdfIn PDF document text
- https://imagebeaute.fr/userfiles/file/80596530204.pdfIn PDF document text
- http://bugaboo-buffalo.eu/UserFiles/File/40076923348.pdfIn PDF document text
- http://homenet-spb.ru/userfiles/file/zonitexe.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6eba3c1a7801481db07f8d2e79dadb5a/74530328894.pdfIn PDF document text
- http://weifong.tw/fckimages/file/likepakaxakivedutel.pdfIn PDF document text
- http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/gixuwoledijovewirasutajo.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8279fbbafe2970220dd3b607b74d15f9/desuwatubifamukek.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/91335018848.pdfIn PDF document text
- http://tokyoto.pl/UserFiles/file/pamewodoniposodezanemowo.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56445a831d---gopukanexabete.pdfIn PDF document text
- http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/920a0a7182a83c0cf851e51233c957be/15036560300.pdfIn PDF document text
- http://ministerium.pt/files/vesatu.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/94bc7fdbd5dfe6622454e7e154aa11b5/56358577472.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c21c161c0---52074162583.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_off0000c62c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC62C	16184 bytes
SHA-256: `ac8f33aa429fd10cd8994e6db7a721e5be5df6b755e698698aed46ff809c284d`
`font_01_sfnt_off0000ef6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF6A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010781.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10781	10768 bytes
SHA-256: `47529850b0669e47aecc5bbe8bc9dc7c4dbeb4160e966f81c75add571e3ad98f`

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