PDF malware analysis — malicious · 361c8938e04aa83a

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 19:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 40e25ce0725f36aa017106cbd8e49a3b SHA-1: 5f6926c9210b4424d334170fd8f456c5b96da3b3 SHA-256: 361c8938e04aa83ae4087a4331eb26663538372e825b3dea067cf194e786ffe7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the T1566.001 (Spearphishing Attachment) technique. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=completely+revolting+recipes+pdf PDF link annotation
- http://handinks.com/ckfinder/images_store/files/55100421240.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e56e4e21b---30724669533.pdfIn PDF document text
- https://fetogram.ir/images/upload/files/8052186595.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612803a8e35f1---1759687485.pdfIn PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c58cf9bccd4---235229686.pdfIn PDF document text
- http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160859987ba612---keririko.pdfIn PDF document text
- https://watertorens.nl/userfiles/file/mosavuxijasobinepu.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/47fc1eabda6650c7eeafada6f02a4cc2/63275774123.pdfIn PDF document text
- http://bakoca.hu/files/file/73802838179.pdfIn PDF document text
- http://lsbwg.com/ckfinder/userfiles/files/20210628/0003222500.pdfIn PDF document text
- https://wipaphun.com/UserFiles/File/pokajobonapopanifil.pdfIn PDF document text
- http://poorclarescork.ie/images/xopekomitelebapusi.pdfIn PDF document text
- https://johanbjerke.se/userfiles/file/tejodi.pdfIn PDF document text
- https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/lgs87unn8ullsgnin0j91o4oce/liwilizirifekuzaxopa.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ea8mn9jgm6st9ikpbpa4ifa6v3/26712670762.pdfIn PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/007c13d32f3209f682315451594e3cfb/busakapiwej.pdfIn PDF document text
- https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/75a2f0a17825b245a04a91219db81795/36039452150.pdfIn PDF document text
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9ccbc1bb0109d10689915e66ff71d224/reduxup.pdfIn PDF document text
- http://fine-trading-knotwork.de/uploads/media/kitapomele.pdfIn PDF document text
- https://alyansdugunsalonu.com/userfiles/files/labazajojazixo.pdfIn PDF document text
- https://ctners.com/ckfinder/userfiles/files/6944430572.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b539b00516ea45b6b39c71754ea54579/86941730842.pdfIn PDF document text
- http://burragebrothers.org/demo/jolie/beta/userfiles/files/tevujimave.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/62b5b77065bc08a8ce102ae6ff3cff93/58478167536.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_off0000ddc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDC2	18008 bytes
SHA-256: `c5e4ab9f6698d6f7a1214ae0af1f6fe85487bb1d6ebd9fc9cdf043c1dac855e5`
`font_01_sfnt_off00010c35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C35	11012 bytes
SHA-256: `b458b28e76ac7419df1e75fbcd5d8f13e2900138d9d78539528094f0e05f3492`
`font_02_sfnt_off00012598.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12598	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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