PDF malware analysis — malicious · fd0f1d70aeed9a7e

MALICIOUS

PDF

76.0 KB Created: 2021-07-27 04:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d3ee8d2ef02af90e591ed38e6aaf3406 SHA-1: 688ebad37372f505c8a72c16632aa1d470dd004e SHA-256: fd0f1d70aeed9a7e457b0052403eb6012c7ed942775f32c9dba8436de64e3413

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, hosting numerous PDFs on compromised WordPress sites, which is a common tactic for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the true origin and purpose of the links.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e5a8185b---86601429212.pdf In PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b5c646ca6---79182914126.pdfIn PDF document text
- http://santamariamikado.com/uploads/files/8069296791.pdfIn PDF document text
- http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5c315fa29643c999a235407699a2389e/vezawuraxugoxis.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d418637acf8c081bcb62cf2336386331/23967052235.pdfIn PDF document text
- http://okmarin.ru/userfiles/file/lipusinumitikamuk.pdfIn PDF document text
- http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f6c95da0---53241269319.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4d3c4be2---16550298373.pdfIn PDF document text
- http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bunedoluwovomiwi.pdfIn PDF document text
- https://zohopinler.com/calisma2/files/uploads/wogis.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/subasaxalutarerurupot.pdfIn PDF document text
- http://msinziniering.com/userfiles/file/vogiwenujapaxagesasi.pdfIn PDF document text
- https://rh-h1tapi-turbo.com/contents//files/35980283603.pdfIn PDF document text
- http://dulichtantai.com/files/uploaded/files/95252685775.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/kt669s098l89alvckurrom79li/37683302075.pdfIn PDF document text
- https://prana.video/wp-content/plugins/super-forms/uploads/php/files/vcslkhlgptuenfufsjnd3pqe36/rejupavibufipukuxebazes.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea2a8bfe45---70166123956.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6831e9b542---zegikaloxefeguw.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081423bd2da7---jutotigunisis.pdfIn PDF document text
- http://firewheels.pe/userfiles/file/89029821620.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/23ccf719926bac2b6ed8f235ec67b695/14416040926.pdfIn PDF document text
- https://dimensioninteractive.com/WYSIWYGImage/file/61739531832.pdfIn PDF document text
- http://www.39koratmachinery.com/file_upload/files/nenasixoluvujoripokefodo.pdfIn PDF document text
- http://sutinlawkrabi.com/ckfinder/userfiles/files/neberuj.pdfIn PDF document text
- http://cuacongtudongbinhduong.com/upload/files/15043371076.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bpmrm6dbko8r036iv5oe7gk2eh/puwizowafevomabijitejo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ib+literature+paper+1+rubricPDF 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_off0000c943.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC943	16364 bytes
SHA-256: `26521acde0642e696660fc596f4f748b43e15d2743ae6dab48695ba899a187e7`
`font_01_sfnt_off0000f352.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF352	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010b69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B69	10220 bytes
SHA-256: `d15857020a42d0df39cb0b282c0ffded42316d26a046a257e13de8e05cbd6df9`

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