PDF malware analysis — malicious · c2e9cdb410742d11

MALICIOUS

PDF

74.2 KB Created: 2021-07-03 00:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 1ff99b9c6277834c6ab198093ecad076 SHA-1: cc690e2e294c9f869393f07c6acfd9bd52803a72 SHA-256: c2e9cdb410742d1101094855c9fe52bb5b89e57989112142bcd1dc9e0057cb97

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to exploit users by directing them to potentially harmful external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://laborke.ru/uplcv?utm_term=manual+to+automation PDF link annotation
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8db17db94---3158376792.pdfIn PDF document text
- https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/40fc04b7403ea7a528c9d9189bd3dfbf/roxusepesalepuzo.pdfIn PDF document text
- http://artside.org/data/temp/file/pumod.pdfIn PDF document text
- https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/o4j22sqgtjtiofgorb4n8676k8/8059705624.pdfIn PDF document text
- http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1bec6240f7f11efeb35d9e596d54dfd8/14098552518.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f2ce01e3---kubiwoluzamakifutikowikaw.pdfIn PDF document text
- https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a539f83d43a5c10c0ffded96f0714739/22582487255.pdfIn PDF document text
- http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/tqb8rmlf5cgaultspaei7k6bg8/95844502222.pdfIn PDF document text
- http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/leleboboxokeminun.pdfIn PDF document text
- https://mzr-avocats.com/buddha/ckfinder/userfiles/files/16127913954.pdfIn PDF document text
- https://loctra.net/userfiles/file/73775184400.pdfIn PDF document text
- http://maxidmum.com/images/upload/fck/file/45678087697.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4385a6410---dabaweluwusinapu.pdfIn PDF document text
- http://learnazia.com/fck/imagesfile/3687396404.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2849aabdaf---gamevoxejobo.pdfIn PDF document text
- http://ukwoodrecycling.com/userfiles/files/74801717351.pdfIn PDF document text
- https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/704f68867944f67c7048c40f1dd987e4/xuwuzirumotanodopobon.pdfIn PDF document text
- http://stagelight.pl/userfiles/files/kowokizufisulisakadanu.pdfIn PDF document text
- http://rainbowcaterers.in/userfiles/file/tagoj.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5c3728dac0f45ff51b94cadf261ef118/50249269533.pdfIn PDF document text
- http://cuatro-pr.org/sites/default/files/file/tutewotojonuponosapig.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bi8qblcugp5cmlfaf0gu74pv42/51136194030.pdfIn PDF document text
- https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160941f328cbc8---31098240564.pdfIn PDF document text
- https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/98d9619b2c500aac2b40fe00d07f523f/25438935232.pdfIn PDF document text
- http://nutrisoilvietnam.com/upload/files/89669983292.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b397b0e1f6c.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_off0000c449.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC449	16152 bytes
SHA-256: `4d7ca0b337a57fd141d0cd36bffcb9910e1d6bc37f24b31144f39e8c6971c7ec`
`font_01_sfnt_off0000ed8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED8D	9960 bytes
SHA-256: `eb350e56a5608392bcad2b5e17f4969dd6223d939cf656b560906148b12788a4`
`font_02_sfnt_off0001037f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1037F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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