PDF malware analysis — malicious · b507068255364442

MALICIOUS

PDF

86.4 KB Created: 2021-08-22 01:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: e064f965eb1f515585388c5348398cba SHA-1: eca76f18d6b89c3cc367c171aea214f5a3195a6c SHA-256: b5070682553644425254b9549bab514e01e0464626ecc1379e69a5eedec44afc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be redirecting users through these links, likely to facilitate phishing attacks or malware distribution. No scripts were extracted, but the presence of external URIs and link farm structures strongly suggests a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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=catholic+university+of+malawi+application+forms+pdf PDF link annotation
- https://skvely-kup.cz/files/file/fimobivosopejexupupogoka.pdfIn PDF document text
- http://eko-inwest.eu/upload/file/metebisenafajen.pdfIn PDF document text
- http://bright-inter.com/file_media/file_image/file/xetipegewimoxu.pdfIn PDF document text
- https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/vovekafaxape.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100fc5dd89d9---pigixexigezu.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/r1hd6s129ej2pu3ogik5nk21h9/zosezoxufizirojoxusenolen.pdfIn PDF document text
- http://challendor.com/fckeditor/upload/file/68510543075.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9662088eab---14074907584.pdfIn PDF document text
- https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/7a1fca4c5d8f2116e36535c1cbe6aae5/32974530821.pdfIn PDF document text
- https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160949d4a855f9---72482697789.pdfIn PDF document text
- http://aweibel.com/Photo/file/mamexi.pdfIn PDF document text
- http://www.klccpa.com/userfiles/file/In PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vbstsf5e7dbgcnfripnbq6k856/65822429088.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33d66e7872---nixezo.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2b9059b51ddc466dc760b2a3e77b5bc5/6297739202.pdfIn PDF document text
- https://windfreeklima.com/upload/ckfinder/files/2546571041.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083d7cb8f7be---geposozisudumenitizokakus.pdfIn PDF document text
- http://darec.sk/files/files/palosemirevisagi.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085328ed4d26---refival.pdfIn PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb24d3e53---dewaxow.pdfIn PDF document text
- http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nokozuxopomojikeregud.pdfIn PDF document text
- https://snqrsl.quebec/upload/editor/file/96552040949.pdfIn PDF document text
- http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a35ec8a1bec995ce382558b5e91760e8/34628877554.pdfIn PDF document text
- http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2b945e936---4082607702.pdfIn PDF document text
- http://tachikawa-derma.biz/ckfinder/userfiles/files/jusevijamasozirofi.pdfIn PDF document text
- http://cosmik-kinoteatr.ru/sadm_files/74903942907.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_off0000eb67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB67	17240 bytes
SHA-256: `2236b9a8dc3c71daa76a869fd844b132f16664e805192ebd4a5299c256700024`
`font_01_sfnt_off00011837.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11837	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001304e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1304E	11284 bytes
SHA-256: `0cd26a96cd54adb2aa94bc1902a59e78501b6d9c231e7edef0c9de8e5ed6ad70`

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