PDF malware analysis — malicious · 57d603b42cb5a3a9

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 20:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: a425cdab9355aa9c3ed190b133e8d7e3 SHA-1: 2b3862b29d4e6f54dc5d7f84e54c57543e60e752 SHA-256: 57d603b42cb5a3a970282e98003361fcebd7f76d20e4cbc3239cbd704ba09db2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicate an attempt to obscure the final malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://aarhuskortet.dk/images/file/dusorexuriranu.pdf In PDF document text
- https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8b2253b5812f15a5264b97d49fd53bf5/90282212038.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f85599ff---21643706876.pdfIn PDF document text
- http://grawerlik.pl/userfiles/file/616809081.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d0903212b07---87902205904.pdfIn PDF document text
- https://anpheatingandac.com/nbloom/fckuploads/file/sugapupafoxubo.pdfIn PDF document text
- https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/4b40334807996684f01b338b0a08aaf6/kupakewezunolero.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kubomowusapi.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/537450f5f54f0c06bd178fc0995651c3/nupezelalaxud.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7badd74eaf19297d633ef1924c4563ed/mewuxizomaseg.pdfIn PDF document text
- http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1a4d457e1---15468864216.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987c9def2f6---duxasalunarojokejuv.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ede5f7dcea6bdfe8e8d76cf7c5308827/41797437415.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086349d9715a---gedakagudenozegu.pdfIn PDF document text
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a745b62754---23994534923.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/26d70089a4d20399eea693be0dcbf4a9/ziwuxagimi.pdfIn PDF document text
- https://kme.pl/global/app/webroot/uploads/file/16233305162459.pdfIn PDF document text
- http://aelma.com/sites/default/userfiles/file/8713233427.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2f25d2c5fa99807d9ba16220979798cd/mipitomuwoxapakimol.pdfIn PDF document text
- http://stlukesmn.org/clients/17773/File/nukevofirolegoma.pdfIn PDF document text
- http://autosklo.sk/pictures/file/zaximogikoxomutaka.pdfIn PDF document text
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8e800ff6a9390e85d7c2863c0ca910b7/34699649864.pdfIn PDF document text
- http://andrewsexes.org/clients/867461/File/32879113315.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cebaca05eeb2fc9de15029792e70cb4d/45422533886.pdfIn PDF document text
- https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0b4331b9ba3f422427ebb4176146e0d4/97816239519.pdfIn PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075021605cfd---43182195148.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+open+a+chess+game+evans+pdfPDF 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_off0000fc5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC5B	16464 bytes
SHA-256: `39f10816b8dc781905b1c8265cfe918e8164d91425de81cb6f4db3125e962e25`
`font_01_sfnt_off00012734.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12734	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013f4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F4B	10972 bytes
SHA-256: `b04c1bd88cfe159c894dd31454d8662b1ae253fbb1fcfe2bf180d6d862a5ca6e`

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