PDF malware analysis — malicious · 8159c27af09be36b

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 00:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 5381954af73101958ed80c45751b245b SHA-1: 3a3f367bad5f8ea40ba8cc118b6b886b461b55b9 SHA-256: 8159c27af09be36b5819b72e62b0da23cfd918066c1d0bc9b2ada85e80f3b541

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The presence of a link farm pointing to compromised CMS upload directories and disposable hosting suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate it's designed to lure users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffd324889c---wuwitojuverut.pdf In PDF document text
- http://thedewakohchang.com/image/upload/File/1991438651.pdfIn PDF document text
- http://artemon.nl/userfiles/file/pemifamivu.pdfIn PDF document text
- https://mandaljeebanking.in/ckfinder/userfiles/files/64668062385.pdfIn PDF document text
- http://naturabliskociebie.pl/userfiles/file/66479321824.pdfIn PDF document text
- https://shreenatharcade.com/userfiles/file/1297263669.pdfIn PDF document text
- http://daglichtfilters.nl/ckfinder/userfiles/files/viduxonizogej.pdfIn PDF document text
- http://crystal-lamp.ru/uploads/files/jevoxilevevujuje.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10d0b9a7b---jikojowawo.pdfIn PDF document text
- http://bogaarchitetti.it/userfiles/files/budex.pdfIn PDF document text
- https://ivanamihic.com/files/83383062225.pdfIn PDF document text
- https://rimsball.com/ckfinder/userfiles/files/36909601084.pdfIn PDF document text
- http://wannawwannie.pl/userfiles/file/70386687989.pdfIn PDF document text
- http://www.jfac.kr/ckfinder/userfiles/files/zitamebo.pdfIn PDF document text
- http://gmart-express.com/demo/uploadpic/file/finavegitanobamuvav.pdfIn PDF document text
- https://10kshot.com/customerinterview/ckfinder/userfiles/files/27673747180.pdfIn PDF document text
- http://chi-kara.net/Upload/files/xelagabifew.pdfIn PDF document text
- https://fleschimmo.lu/userfiles/files/vizozekenasifokumazijuf.pdfIn PDF document text
- http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/f5150a54c6ccedd105b41f58f5974a0f/74256310486.pdfIn PDF document text
- http://rongqichem.com/upload/files/90666542389.pdfIn PDF document text
- https://beaszemin.com/files/52119834829.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/gdbuucftebrrj9bfgonq2cv2g1/pitixekolo.pdfIn PDF document text
- https://myphi.biz/nbloom/fckuploads/file/pamudivitalesupes.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0f6a2bab---5786889736.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=k+lite+codec+pack+for+android+mobilePDF link annotation
- 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_off0000f22e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF22E	10836 bytes
SHA-256: `eb7f9d7402f4cbd13b94c1a671e1cf3af8d276bb7d3e9f29333eca6e369b358f`
`font_01_sfnt_off00010ae9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AE9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000122fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122FB	18924 bytes
SHA-256: `cbf8bfbc81169cb87a6480cbb380008197ed024900f2d277e63eb26504f49a94`

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