PDF malware analysis — malicious · 4b604c3e8e015b76

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 08:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 7c468648ebe18224ce901439f9d02a03 SHA-1: 36eb314e36f18766eeeb32e2d3e8acb8e247f3fd SHA-256: 4b604c3e8e015b76f5aa5cb2bec7381b84a866e4e5bdb9deb34e8f0dec2d1fb6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and URL patterns suggest the document is designed to lure users to potentially malicious or SEO-abused websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9783

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://archism.ru/uplcv?utm_term=active+harmonic+filter+pdf PDF link annotation
- https://uniqrelation.com/userfiles/file/64294435504.pdfIn PDF document text
- http://podlahypilat.cz/admin/file/22741688646.pdfIn PDF document text
- http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/61919015017.pdfIn PDF document text
- http://hiredriver.com/uploads/assets/files/29969049664.pdfIn PDF document text
- http://peneleos.pl/userfiles/file/59159468288.pdfIn PDF document text
- http://mfahk.com/upload/files/jozivulemolawifolis.pdfIn PDF document text
- http://chip-chup.hu/upload/file/5011176709.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d24b6f54f---kidalirupone.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1aa926f6---19807924666.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6caee0b457---24195910113.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5289eefc5a526b1c162f1f5977ff432a/gufuj.pdfIn PDF document text
- https://tectrongim.com/uploads/files/nujanopegowumuxebeniwomej.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b74de92464a---polulebisevowewu.pdfIn PDF document text
- https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6c134f845e07e88b6a38b8b86ffcb7b1/168719416.pdfIn PDF document text
- https://misbahelmudii.org/ckfinder/userfiles/files/58978116825.pdfIn PDF document text
- http://waberry1969.com/clients/877040/File/zajid.pdfIn PDF document text
- https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/18a9a53484b36bf697f01134c86ca3af/12085807029.pdfIn PDF document text
- http://praguetransfer.com/files/file/25477726105.pdfIn PDF document text
- http://quickvideo.nl/userfiles/file/11053364877.pdfIn PDF document text
- https://abofahed.com/userfiles/file/15247809570.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/66592400225.pdfIn PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/u9euiiub5c2dp2c7bjnm3d2og6/demerurixelekudo.pdfIn PDF document text
- https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/75d4364a25f5ed867002bd52b634d605/34966978332.pdfIn PDF document text
- http://dienvietbac.com/uploads/files/kekuziwukuvujifise.pdfIn PDF document text
- http://55thocscompany.com/clients/62662/File/fofirirefevadisonemuregej.pdfIn PDF document text
- http://caythuocdangian.net/images/files/xewadi.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off00012448.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x12448	18384 bytes
SHA-256: `15d822860411d9a73f2f5328dba0868717a8bb362ce75d841300d5f800c7351a`
`font_00_sfnt_off0000c8ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8EA	16748 bytes
SHA-256: `5a5df85ce5eada2e3192b40958d49981e84f97bb6ebfefdb2917ac3ce10811d8`
`font_01_sfnt_off0000f399.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF399	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010bb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BB0	10764 bytes
SHA-256: `81bdff6406f9d3dfc1a35e2cf064b044ac7bd877d8256f3862eee7045eaa727b`

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