PDF malware analysis — malicious · 66ee7003770ecf63

MALICIOUS

PDF

92.3 KB Created: 2021-07-30 17:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 644768acd671d8166ea1bf13c0f066ca SHA-1: c9b92a2c3bded7a79e18e08962b496865b660780 SHA-256: 66ee7003770ecf63729c1eb9004cad6b633032530473fcfcd9b3decd8904c4e4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

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://coretry.ru/uplcv?utm_term=broadchurch+series+1+episode+6+cast PDF link annotation
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7b9a6f23c08cf0aba2a2cf53fed851f0/73705432478.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e7362b5f3---15747017712.pdfIn PDF document text
- http://bidmitt.com/img/files/file/65500054911.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4821002a---51041655055.pdfIn PDF document text
- https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/dusomasujabolanu.pdfIn PDF document text
- http://mywymc.com/userfiles/file/44894665678.pdfIn PDF document text
- https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3842bc1bcb43baac9cb42c443d0c8cf2/sixokagulabixe.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f390b1d0c---51853929073.pdfIn PDF document text
- https://lanjutpt1.com/contents//files/depemadukid.pdfIn PDF document text
- http://sntaviator.ru/ckfinder/userfiles/files/28737018352.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b080cc2116d---pajokijiresofonido.pdfIn PDF document text
- https://angelsstaff.com/uploads/file/tawexu.pdfIn PDF document text
- https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ut3gsrap1l9bhfpf4uv4nl0s23/viluv.pdfIn PDF document text
- https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5c643b9dde9e53a1285b9df2a9a807e3/kefamuzabusozivujofa.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p5vhdtnfr341sv0q23126rmu20/1265338014.pdfIn PDF document text
- http://influences-vegetales.eu/assets/Image//files/57563723971.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607077ccb3c8e---sizis.pdfIn PDF document text
- http://alpha-cp.com/userfiles/file/divurewiloxuwopevo.pdfIn PDF document text
- http://sl-light.ru/design/img/upload/file/xeganemo.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a86bea604---26742784985.pdfIn PDF document text
- http://aescantabria.es/upload/fckeditor/file///62730765989.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e52eb1e28b7---2438266579.pdfIn PDF document text
- https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/r0tkn4a1irckrgrf59sr25ila0/84842082809.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ea9245b11a359d9601eae57156a7819c/8005353815.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_off00010539.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10539	10832 bytes
SHA-256: `245d8711ef3b42f43d6cc52027925cfed36eadcc4c26a6fbb887d60ea806da00`
`font_01_sfnt_off00011e6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E6F	16996 bytes
SHA-256: `13da1b10ccb3d0fab60daf8d84341419ced13c2620684dfd2849be8dfa9405f9`
`font_02_sfnt_off00014a6c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14A6C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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