PDF malware analysis — malicious · 82b0351b6de749c6

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 20:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 320878808ecb10f88e7e7e726a7d7768 SHA-1: c3b3bb55ecd97b2bdd7d8da19dc5dbb53a489112 SHA-256: 82b0351b6de749c66a086ff7785f495912a7e3597571523aed7122e82b5e6ac8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to a compromised WordPress upload directory, suggesting an attempt to host or distribute malicious files. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics suggest.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ad73fee579f---8025735454.pdf In PDF document text
- http://ttworld.hu/uploads/content_files/files/muvowupitobexi.pdfIn PDF document text
- http://beiwendq.com//data/attachment/file/jolonowakesubas.pdfIn PDF document text
- https://armagedonspedycja.pl/files/file/mamusu.pdfIn PDF document text
- https://artenika.pl/fck/file/lujugisofip.pdfIn PDF document text
- http://birzebbugastpetersfc.com/files/file/lakoliw.pdfIn PDF document text
- http://ahcxdq.com/uploads/file/280211586894.pdfIn PDF document text
- https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/81120206861.pdfIn PDF document text
- http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/kupusatejerurugenoju.pdfIn PDF document text
- https://daaeportrett.no/upload/file/wuximoratajefirar.pdfIn PDF document text
- http://ilovegabal.net/fckeditor/_upload/file/lafarimudifubu.pdfIn PDF document text
- https://nadamasristorante.it/file/15628033498.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1b9202d2c935cfa80d2c9cb4fcfad122/wutedubesuwiluvap.pdfIn PDF document text
- http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/rupefefutojabasux.pdfIn PDF document text
- http://www.workbythai.com/admin/assets/images/8595147003.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/661092851d012c494b036543775809e7/99876666890.pdfIn PDF document text
- https://nakipoglugroup.com/upload/ckfinder/files/bedotid.pdfIn PDF document text
- http://lungshingcentre.com/userfiles/9026288632.pdfIn PDF document text
- http://metafelix.it/userfiles/files/nazebavabukumenukima.pdfIn PDF document text
- http://olech-rzeszow.pl/userfiles/file/xadonulevabek.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/c913687e7e4185975724b9030d0dfc95/wibebedo.pdfIn PDF document text
- https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec145dfe1---27402706702.pdfIn PDF document text
- http://bajcsidavidfoto.com/_user/file/sujemesemuruguguzol.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfa342f612---45013031098.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=katarzyna+michalak+mistrz+pdf+chomikujPDF 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_off0000d6f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6F3	11240 bytes
SHA-256: `9896b102a68edc35ea3d00e3ee0c04388f6f7c5e4667f3f2cfd669488e81003c`
`font_01_sfnt_off0000f121.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF121	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010933.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10933	18356 bytes
SHA-256: `b82bfcae3cca9d642f5d6b13323ade26452b8c6267e0e41297df5a702bc9690b`

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