PDF malware analysis — malicious · 8de9e56718190d99

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 15:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: c7918693f64bff6a78ed04558ac044a3 SHA-1: 05153122c7c66aea78c2a60fc8c287b7f875314c SHA-256: 8de9e56718190d9959ecc84f5fa126efca4516dad16d8c2ed18cf3b34ff336b3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a likely attempt to host or distribute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

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://archism.ru/uplcv?utm_term=action+verbs+exercises+with+answers PDF link annotation
- https://alshaabcoop.com/userfiles/file/84882236848.pdfIn PDF document text
- http://konstruktor33.ru/app/webroot/files/files/zoxarasopimotawe.pdfIn PDF document text
- https://music-group-store.com/upload/files/jurejenofibupanipu.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f6fb0042d4e1178a14b4409a9c217e9c/69503817232.pdfIn PDF document text
- http://unibeauty.com.br/ckfinder/userfiles/files/xaletevumelovow.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c897dec4b69---tagigukidubuteg.pdfIn PDF document text
- https://cvconstructionsgoa.com/pharma/admin/userfiles/file/depoperalapenegewep.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e363dc1ed---tebukowexakovefed.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1a53b441---fukosamiforemujaxomarekod.pdfIn PDF document text
- https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/81bbaf6ba715b85a8c943df115b20e54/napezavojimawabes.pdfIn PDF document text
- https://jin-ji.com/upload/files/fasadipafakuse.pdfIn PDF document text
- https://webhosting4.net/media/file/giwikajekigelowegipeza.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa256123bf1---92380184871.pdfIn PDF document text
- https://editions-tlp.fr/ckfinder/userfiles/files/90386542025.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/g45sqe97i051gkvpn2p4hp5c4i/malol.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/32367706759.pdfIn PDF document text
- https://schlosshotel-murten.ch/userfiles/files/65682550967.pdfIn PDF document text
- https://reazfarah.com/ckfinder/userfiles/files/28555665417.pdfIn PDF document text
- http://emotionpicturesfestival.gr/userfiles/file/52901985517.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611b84b04b811---1042632698.pdfIn PDF document text
- https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d0f3554a1568263119fd9f9caf9b7dba/rumokisativegor.pdfIn PDF document text
- https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c21881f2390fd1c2d6fb1b9589acd622/niluxegupetabix.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607620a55c0bd---85307070694.pdfIn PDF document text
- https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/5c7adc4d1d9be128c359bcd31c946921/mobukobov.pdfIn PDF document text
- http://eugensa.lt/app/webroot/uploads/userfiles/files/88699910318.pdfIn PDF document text
- http://aldo-ins.com/userfiles/file/41260028501.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_off0000e2c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2C7	17704 bytes
SHA-256: `896fca9c5b7af2e263378683ae8ab29762c2f46455b862f8ac8b584d3f352ead`
`font_01_sfnt_off00010fe4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FE4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000127fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127FB	10656 bytes
SHA-256: `b2ae51f7907a08a162c72e9060ce14c844a82c8094a0205a1fde619770961542`

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