PDF malware analysis — malicious · 6bed9c6d6cf7ae47

MALICIOUS

PDF

89.2 KB Created: 2021-07-05 11:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 1f764c51f3e3d33b89ce7cf6b9b1a27c SHA-1: 406dcec8b3c0565a6fad396d83e389543f4c9250 SHA-256: 6bed9c6d6cf7ae4741e9e1988ecdee910fd0fd8ee5afb3c2118d92dc34d736a3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to distribute further malicious content or phishing lures. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=the+complete+book+of+personal+training+pdf+free+download', are likely part of this distribution scheme.

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://crysiq.ru/uplcv?utm_term=the+complete+book+of+personal+training+pdf+free+download PDF link annotation
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf3a6afa07---jupujodirowesalitefir.pdfIn PDF document text
- https://vildmarksjagt.dk/userfiles/file/91146193988.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5iht1bdegnj0gd6jueav03hc65/49890926275.pdfIn PDF document text
- http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607192be5f22d---62546988372.pdfIn PDF document text
- https://saleskerala.com/ckfinder/userfiles/files/58598413634.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc83351e4a5---fitikitezererezefete.pdfIn PDF document text
- http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916fc348bb6---lufunorojavoripixupezuxid.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44cc14e7d---51728346309.pdfIn PDF document text
- http://kolasinprevoz.rs/slike/files/4066886546.pdfIn PDF document text
- https://susta.vn/userfiles/file/31013548207.pdfIn PDF document text
- https://panificiopasticceriabattaglia.it/file/40257257102.pdfIn PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3d2c7be7f73d726be885f7878fd1b4da/26020179582.pdfIn PDF document text
- https://citytrafik.nu/images/file/nazuxidonubipimof.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607612e96009b---mojimasujemenolenabada.pdfIn PDF document text
- https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/qv5g6d1mm75j4kkeuhs4esndfn/45551484117.pdfIn PDF document text
- http://tydafa.com/dafa/uploadfiles/20210701210152.pdfIn PDF document text
- https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/tf9s2a03fecrdi6cks5g9bnm2s/bexonodekeforuz.pdfIn PDF document text
- http://taxicityplus.ru/userfiles/file/62690949655.pdfIn PDF document text
- https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/665929b63e953874e4db7b18b7c1e604/nagojimetonem.pdfIn PDF document text
- http://sklepjola.pl/userfiles/file/14783342674.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/o1ogiqtja31tefbcadtf3cfdig/lenuwifopukagapojegusela.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b812b2345a991e1c45ff9117cdac554e/sepelafelowamoxipor.pdfIn PDF document text
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5d45a954---nutumoxumi.pdfIn PDF document text
- http://meteosputnik.ru/userfiles/file/63183554142.pdfIn PDF document text
- http://prestopc.it/upload/file/98164856312.pdfIn PDF document text
- http://kapalishakti.com/ckfinder/userfiles/files/lebajarabigowidinufoba.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_off0000f82f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF82F	16924 bytes
SHA-256: `9a05daa2e3aa28b4e6f74626516fe5847b8e61bfbde5998b092321043271bc29`
`font_01_sfnt_off0001246f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1246F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013c86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C86	11348 bytes
SHA-256: `f8ac2110ac2f113ca80f4b67d64a886eac742884eefe41d1a8482e0ec18f92ad`

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