PDF malware analysis — malicious · d603c1d24321c4c6

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 22:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: ba67c373dbfe53e7be206d3bc8b8cca3 SHA-1: 2dd42bf2944d0e04721e1b4003610f88a751701d SHA-256: d603c1d24321c4c6436dd5d44d85dcfd27b2176d3fb0c7562a1793429375af43

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The primary attack pattern involves luring users through a document that, upon opening, directs them to external, potentially harmful sites.

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://queure.ru/uplcv?utm_term=fingerstyle+hymns+simple+guitar+arrangements+pdf PDF link annotation
- https://signika.pl/Upload/file/nolonumupividepowej.pdfIn PDF document text
- http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/19915670930.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9afcee296---10840396840.pdfIn PDF document text
- http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9551cea5176ee18492592b0c2d0c274d/popalejades.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/30a813844fe5ca9814113eb4fd20d376/bogumobovuxilew.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112f4ae11a74---nosinibojike.pdfIn PDF document text
- https://domilot.com/uploader/files/98126308362.pdfIn PDF document text
- http://seoaudytor.pl/userfiles/file/pafiwojajonubovokijomop.pdfIn PDF document text
- https://hippodrome-compiegne.fr/www/uploads/file/gevawuduxatadedalefadedon.pdfIn PDF document text
- http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080a8b5d8b51---xomufigesadagifozopowizux.pdfIn PDF document text
- http://aceonlinementors.com/userfiles/file/kisejumukiluzol.pdfIn PDF document text
- http://kardelendalgicpompa.com/uploadfiles/file/49434307537.pdfIn PDF document text
- http://chayka-svg.ru/files/nerodemive.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ogmkg00kpmcg7j18oddb36ajt3/pekusumakikajomogunivada.pdfIn PDF document text
- https://prtl.pl/userfiles/file/vifedaxegud.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bf07ab64d---romaraziwu.pdfIn PDF document text
- http://motivationandmomentum.net/ci/userfiles/files/gukalevifomebopalip.pdfIn PDF document text
- https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/379963a4b2c897d55f53672637d13050/gevubal.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f167cbbbf3b---16425775689.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160788fd0d9793---21836066247.pdfIn PDF document text
- https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b7640b03900328d054fee96897f798ac/6092997917.pdfIn PDF document text
- http://losmarinoslanzarote.com/marinarubicon/admin/file/netejuvixuvu.pdfIn PDF document text
- http://aygroupmuh.com/image/files/ladomixavotazaluri.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e986567de9e---55178402667.pdfIn PDF document text
- https://rivaflo-south.in/userfiles/files/zejisedeleb.pdfIn PDF document text
- http://gioiacompany.net/images/upload/file/56214321926.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_off0000c112.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC112	17072 bytes
SHA-256: `d6235f45b77f73ad571f04b16e4583e9477ece55ba5c9971ef6577e72875d377`
`font_01_sfnt_off0000ece7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECE7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000104fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104FE	11016 bytes
SHA-256: `a443610c65c8e45c9a3e1a47ca21354775e3f9f932ce780b53f45cb84348496b`

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