PDF malware analysis — malicious · 5de639019b2f775b

MALICIOUS

PDF

92.5 KB Created: 2021-07-14 03:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 202fe73ea0a613d99e2cc13e81850c56 SHA-1: 1fafd31a86ea162d1f8577df5071c026ba87eff2 SHA-256: 5de639019b2f775b6726b8239da742711c8300a37387a42ec8fafec548bb4e41

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to potentially malicious sites. No scripts were extracted, but the PDF's nature as a link farm is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9820

Heuristics 5

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://crewmak.ru/uplcv?utm_term=us+stealth+helicopter PDF link annotation
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9634c681---4744589303.pdfIn PDF document text
- http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b94ffc8d62a---55211037397.pdfIn PDF document text
- http://coyada.com/up_images/up_images/96499367215.pdfIn PDF document text
- https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/03lb58spb3vh23t55or46pcjgg/79468106485.pdfIn PDF document text
- http://apluskleaning.com/admin/images/file/82893940090.pdfIn PDF document text
- http://movitecnic.com/ressource/site-image/files/guvutumufovesani.pdfIn PDF document text
- https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/faedd3b2ca8eef9d08023c85dfc0b977/juxudoruxu.pdfIn PDF document text
- http://amblesidewindermere.ca/fckuploads/images/file/labilelevipenugukuve.pdfIn PDF document text
- https://alves.bg/ckfinder/userfiles/files/86641495403.pdfIn PDF document text
- http://gruaszarate.com/ckfinder/userfiles/files/33858379843.pdfIn PDF document text
- https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/691e6d60a37f34aa9503c2c8c5e72903/pukopaxasegiwenakave.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7792bc4af75fa3898e022317b2d85155/75771568024.pdfIn PDF document text
- https://tavio.ru/files/file/88978094189.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o9clmrpik9nn0giplic9rfn1k4/13250401105.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dc69cfa8---8812614016.pdfIn PDF document text
- http://carzip.biz/files/uploads/files/nifuzijisusedoj.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/631cebabcec3a9d34f7e0d3b5222b04f/dagewenit.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6s26o7gg85imragp0pghm7ml0k/1003374150.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd00906735---75516095882.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6410d41b2d---buribedironejusoju.pdfIn PDF document text
- http://abimobiliare.pl/pliki/File/zodul.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833dc4aa2c9---sesixugumerunolugo.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3a15d6894---26794990153.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bf30h39t1t8e5d3rerdvdbm9pf/witajesabo.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/47225c7b0e4bd49d655e495e440fd732/gufesulidala.pdfIn PDF document text
- https://almoheetmanpower.com/public_html/userfiles/file/23960808998.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_off00010894.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10894	10376 bytes
SHA-256: `9a9dda561a246d8c57fc1f4a84726d19e2bc9e1b5c5cfad61734723b5713179f`
`font_01_sfnt_off0001202d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1202D	17084 bytes
SHA-256: `c3886122f48fce1ae38548d37da58ed59a6cd0d171553c57bb55f1d9e093b0fb`
`font_02_sfnt_off00014c98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14C98	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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