PDF malware analysis — malicious · f545d930b59c096f

MALICIOUS

PDF

84.9 KB Created: 2021-07-10 00:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: cfdea232fcae8de1be9eef1511ac8359 SHA-1: ca0fca9629fd43a385da0b3d6fe0ecdd77fef937 SHA-256: f545d930b59c096fb75b6fe4c38fb3822a522aa441b3cc9e5ff30f68c8b8abb6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to lead users to malicious content, 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 https://coretry.ru/uplcv?utm_term=skipping+gears+manual PDF link annotation
- https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b41c7983e9---57163377479.pdfIn PDF document text
- https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ik456gdeeu4j06utrdi3c0krh6/46823140502.pdfIn PDF document text
- https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4436fae88083ee767fb47fcd8bceaa2b/sutolijul.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hm8visu4829ipso0adrsgh9741/79460378384.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086da6d95de0---jujezofuz.pdfIn PDF document text
- https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607350065d7e5---10167158499.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/83767172127.pdfIn PDF document text
- https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add4a2647b2---36649228739.pdfIn PDF document text
- https://actorconseil.com/files/file/denemopekime.pdfIn PDF document text
- https://hgindustrial.eu/userfiles/files/62896248803.pdfIn PDF document text
- http://zdrowejaja.com/Upload/file/vexadajurowotuzu.pdfIn PDF document text
- https://dermatologie-chamonix.com/userfiles/file/ximazabe.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1cdqqvm6uk16ohs777sm2c501/59208221071.pdfIn PDF document text
- https://webtechnocrats.com/upload/file/82921225580.pdfIn PDF document text
- http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3bf70dff18---ladanofuzufiwufezomovukub.pdfIn PDF document text
- https://digireg.dk/upload/24003221562.pdfIn PDF document text
- http://royalgoodviewresort.com/Uploads/file/53179038071.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8b5bcd2e5f2a9b2e81c41d371a301f9b/gamototenegejem.pdfIn PDF document text
- http://optikametuje.cz/userfiles/file/xadupilatoramitu.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8f5a120b459e6709ac6b93eeb5a9ef61/17187832335.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/634447a20f78cd78a933fcc7c0cb1e6d/fimitabusuweb.pdfIn PDF document text
- http://esistore.de/userfiles/file/84489548296.pdfIn PDF document text
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e834c3510a8---zofegarerarodabizowa.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6943c3c3f1b50c9c2d3c6435b689701b/15637606545.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9f291a0d41475622924c50f4ffaaa5f0/rogoxejemowureruvakof.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_off0000ea16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA16	16920 bytes
SHA-256: `4b8e9ac80693dd3d91dd9e8ddbbeff6c0f63105dc53711f55dcc80f7ec080b4a`
`font_01_sfnt_off00011677.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11677	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E8E	10644 bytes
SHA-256: `ee9a286d809c08448792531a69b9f3ea62ecdeeb7ac2fc672af2a7052ad4d682`

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