PDF malware analysis — malicious · 198b9c5f93f28e8e

MALICIOUS

PDF

75.3 KB Created: 2021-08-10 13:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 4ac5ffd9b340f047f6a83d438a5170c2 SHA-1: cbe196797ba3897cd60bca491ef0a0c71b54f258 SHA-256: 198b9c5f93f28e8e776cb8893d822fbfb39bb764e0f7dfa92f9395e84bf2830f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links are likely intended to redirect users to malicious sites for phishing or malware delivery. The use of 'utm_term' in one of the URLs suggests an attempt to track user engagement with potentially deceptive content.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://nomylo.ru/uplcv?utm_term=steroid+conversion+chart+globalrph PDF link annotation
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cb82b044a---68638465485.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e46bdb420---57715272370.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d0f8ce544d5a3580e634a7b4914d1155/41488666261.pdfIn PDF document text
- http://nocleginaplus.pl/uploads/userfiles/files/javolefabi.pdfIn PDF document text
- https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/tn7aajvo2c1h7s1jtv6chnvnj0/31188722432.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e598046fcfa---vamopafoxoxilekej.pdfIn PDF document text
- https://jotelek.hu/files/file/80119094278.pdfIn PDF document text
- https://mecaniquekd.ca/upload/file/jolefilekuwavefedizimit.pdfIn PDF document text
- http://goteneplast.se/files/images/file/81892609010.pdfIn PDF document text
- http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/vevotimelemekorikilewa.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/b00a4063e8f0476ed9a0a254142027d1/47963304503.pdfIn PDF document text
- http://st-communications.com/ckfinder/userfiles/files/fewulesexagune.pdfIn PDF document text
- https://ceccarbotosani.ro/userfiles/file/56685936487.pdfIn PDF document text
- https://dptech.vn/uploads/files/10629218471.pdfIn PDF document text
- http://euredit-editions.com/userfiles/file/metaropidosinuseji.pdfIn PDF document text
- http://arcomproltd.com/userfiles/file/75247709295.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1ea9ed5598f1d7ba0f054c83359cabe2/mavagojinipixa.pdfIn PDF document text
- http://home-hj.com/up_photo/file/69033104917.pdfIn PDF document text
- http://digemnd.com/UserFiles/file/77766333081.pdfIn PDF document text
- http://campbellelectronics.com/uploads/vawakiranerabadidamugu.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c9d54a1e343ada45283c396c29848745/gilasujelom.pdfIn PDF document text
- http://automotiveenergy.cz/userfiles/file/60668175695.pdfIn PDF document text
- http://sasolution.kr/userfiles/file/konulisefasonexadu.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90e1e2b70---92728760733.pdfIn PDF document text
- http://turinhotelcompany.com/userfiles/files/gexameledokivu.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_off0000c195.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC195	17008 bytes
SHA-256: `e533984ac9c60a82110bdb0515bbe0672cbe824146a3444a3f21d9240149e19a`
`font_01_sfnt_off0000ee47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE47	11072 bytes
SHA-256: `0ded39d0f69669d25a381dedefd2d4a6f0dfaa3c13e2db46c14e0bee6a110e77`
`font_02_sfnt_off00010793.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10793	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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