PDF malware analysis — malicious · 833a3b41f9b2a8c2

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 11:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: dc39d8c4f8070488f665eff07f020d96 SHA-1: 1fd44995abe302ff0299d2466b1a8298c0476d47 SHA-256: 833a3b41f9b2a8c238aadce2f399b0ec08b8bd1d7709287ddb26436d7cc90d48

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The primary purpose appears to be directing users to potentially malicious or phishing websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://allytemp.ru/uplcv?utm_term=reading+comprehension+worksheets+free+grade+3 PDF link annotation
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b31c918854---51185526880.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/eb38130a286b8de66898db7554ff752b/93659235440.pdfIn PDF document text
- https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4cs6an65emcilije7pnf48s1ap/10843958810.pdfIn PDF document text
- https://angkortaxiservice.com/userfiles/file/6384641373.pdfIn PDF document text
- http://bpsstudio.hu/uploads/pipekezasulijememogabigun.pdfIn PDF document text
- http://crmrealty360degree.in/userfiles/file/binowoba.pdfIn PDF document text
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611930bc09acb---wapabijawipamibilajaxa.pdfIn PDF document text
- http://usaoxin.com/userfiles/2021-5/file/wafadidanivexefaj.pdfIn PDF document text
- https://uniontend.com/userfiles/files/80161010065.pdfIn PDF document text
- https://lufty.cz/UserFiles/files/kodit.pdfIn PDF document text
- http://ricarda-allegra.de/userfiles/file/dovanalatufaronusubib.pdfIn PDF document text
- https://faprosid.com/file/bakolevivezanesavapogoza.pdfIn PDF document text
- http://shadesvalleymounties1969.com/clients/868959/File/95270031913.pdfIn PDF document text
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d73b898421e16d0bdad3d463ba7d062e/lalesunararenuj.pdfIn PDF document text
- http://winecellarkeeper.com/ckfinder/userfiles/files/7207710264.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/chs64vf4cb9md3e43nb40n6i8c/kokux.pdfIn PDF document text
- http://grandp.ru/userfiles/file/16104768978.pdfIn PDF document text
- https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ef6e88c8ee5b833d23827cb876f84bdc/22573992920.pdfIn PDF document text
- http://cerezolorente.com/files/cerezolorente/_repo/file/bazadukefajaremamitozegil.pdfIn PDF document text
- https://vibangthuaphatlai.net/uploads/files/78887559976.pdfIn PDF document text
- http://nitexprofi.cz/userfiles/file/rabaveduginero.pdfIn PDF document text
- https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0cf6f34e73cae63c13ccd9c31dd06c25/28355237350.pdfIn PDF document text
- https://laatjehuisweerstralen.nl/upload/file/xufajajejokoz.pdfIn PDF document text
- http://pc-driver.ru/userfiles/files/madifabilodevugegoleju.pdfIn PDF document text
- http://cnsgawefgl.netsociality.com/upload/files/mifevewitutoruzufesupu.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_off0000c0d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC0D2	11416 bytes
SHA-256: `b1f5c496bf4e5390d4c639264e754aa801555f0f82e6583b82eb3a1f82160f6e`
`font_01_sfnt_off0000db6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB6A	19532 bytes
SHA-256: `3b042c6b0fa61beea4c6f307f621f99c6785ea88253c3715512465b1f37e9bb1`
`font_02_sfnt_off00010c82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C82	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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