PDF malware analysis — malicious · 637ad1110c96b975

MALICIOUS

PDF

65.1 KB Created: 2021-10-02 23:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: ec927d45c77d7374866d80448b49f9b0 SHA-1: 81b220b3407c3e4f757b7f3d97f80b84f89680b0 SHA-256: 637ad1110c96b975b9bb7f4e95313821fb3ac8424cea7748ddb909392c607417

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ClamAV heuristic identifies this file as a phishing trojan. The presence of embedded URLs and the link farm structure strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier suspicious score 0.4355

Heuristics 5

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
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://ketchas.ru/uplcv?utm_term=what+is+used+to+treat+trich PDF link annotation
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615397b97c02e---70813805987.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161331c2a21667---lugukegifelolipowudutunax.pdfIn PDF document text
- http://seamacros.com/upload/file/2589835293.pdfIn PDF document text
- https://bestcoloringpages.com/userfiles/file/70370144210.pdfIn PDF document text
- https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3546acbb465560b84e381817596eef28/wirekusojemomufixotag.pdfIn PDF document text
- http://vtdsbinhthuan.vn/public/uploads/userfiles/file/80869509300.pdfIn PDF document text
- https://mosconi.net/userfiles/file/23046916425.pdfIn PDF document text
- https://learn-atdi.com/uploads/files/basidinubiwunune.pdfIn PDF document text
- https://alteanetworks.fr/img/file/52573089400.pdfIn PDF document text
- http://chinastom.ru/userfiles/file/jegerevuzotalunavuvur.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9920b1b487d39663e8d8269a99eeff16/43751071725.pdfIn PDF document text
- http://americandeliorder.com/uploads/files/3168159240.pdfIn PDF document text
- http://abwbaltimore.com/uploads/files/98645542294.pdfIn PDF document text
- http://abdon.madteam.net/ckfinder/userfiles/files/90049603218.pdfIn PDF document text
- https://rolcsi-bau.hu/userfiles/files/seviked.pdfIn PDF document text
- http://exteractif.fr/pictures/2/kupemetuxenumanimi.pdfIn PDF document text
- https://barrier.exma.cl/ckfinder/userfiles/files/18128272615.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161498e8a99fce---fejerotifofuja.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161565a395003d---xusixipagebinowedaloxavig.pdfIn PDF document text
- http://hcvitamin.com/webroot/img/files/7410735980.pdfIn PDF document text
- http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161450dd31d844---22758932248.pdfIn PDF document text
- https://ksmt.edu.np/assets/ckfinder/userfiles/files/50738016272.pdfIn PDF document text
- http://rowadhr.com/app/webroot/upload/files/xizitavefi.pdfIn PDF document text
- http://uni-farm.pl/ckfinder/userfiles/files/92504438419.pdfIn PDF document text
- https://sudhirsachdevaclasses.com/ci/userfiles/files/38312020831.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b56d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB56D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cd84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD84	10412 bytes
SHA-256: `0885c26f613ac6a5ceeddfa24bf65131de0dcc0d98a67dfe6fc5e75f7bcd98ab`

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