PDF malware analysis — malicious · bff17980e05cf728

MALICIOUS

PDF

85.5 KB Created: 2021-07-10 07:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 3f36aaef2f0729f3539d61f14503e91a SHA-1: d9ed399c50febc0d3b9d30e1d3662679064397c4 SHA-256: bff17980e05cf7286afb32737691c1656b7be7d8f73dc3ed8ba199daa450dec5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple domains, many of which are hosted on compromised CMS uploads or disposable infrastructure. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://castrolmintabolt.hu/images/upload/file/86680517648.pdf In PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2557a6b134---jukenin.pdfIn PDF document text
- http://arcomproltd.com/userfiles/file/bebimebidotizazidi.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16070a48f0ce3a---51315403044.pdfIn PDF document text
- http://www.maderas-navarro.com/ckfinder/userfiles/files/luzenigoguzem.pdfIn PDF document text
- http://tokyoto.pl/UserFiles/file/93060111030.pdfIn PDF document text
- https://allmassage.net/upload/file/20210530051003.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54567b6cee---8282625621.pdfIn PDF document text
- https://samsungklimamodelleri.com/upload/ckfinder/files/bedetozexako.pdfIn PDF document text
- http://graham1978.com/clients/79565/File/73299641580.pdfIn PDF document text
- http://daugiavanthienphuoc.com/media/ftp/file/67076482512.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d84e6f43---sijamusananumilolerepasi.pdfIn PDF document text
- https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/539c7372dbc5fe8d94c81716cdb6bc11/zesopexabiwusiwexela.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b7c4dc1d121e672e47b9126b8f0b0b23/40451855023.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5d1bfaddfe6ba2c42e0b856f6ab3eefa/65783664578.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e566a0d323---perujodusadolowugemopi.pdfIn PDF document text
- https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a2bb5f8be---57876234465.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/14eb1c679444602c0dd870fa4c3a588f/polavinofiveloje.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732c0e9f02a---76209275991.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/j8ifns7rbjmdqs6oi8e40h05bt/satowenogudu.pdfIn PDF document text
- https://bedandbreakfastchia.it/userfiles/file/11119822542.pdfIn PDF document text
- https://acryl-bg.com/userfiles/file/lirikumedomeri.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5177aa4340---vojugidujelegatijopekupo.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde78c0791---32778746392.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6342391f22---28991113721.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=overcoming+the+power+of+darknessPDF 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_off0000eba5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBA5	11288 bytes
SHA-256: `05645b66b123dde1dd7f6b21deaa8293cad0089c84501823b88c682c48d39f6f`
`font_01_sfnt_off000105d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105D8	16524 bytes
SHA-256: `430afaba2a6b64abbec0cee586ea5cd9813b1a1a3b193658d11546411e3dcfa2`
`font_02_sfnt_off0001309f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1309F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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