PDF malware analysis — malicious · 6dda2f421c5b8d05

MALICIOUS

PDF

86.6 KB Created: 2021-07-20 10:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 8c993938eee40d2b9d3ef83a20491b64 SHA-1: 4ebc57ff06be5becdaeba099fbd7bbc044578f62 SHA-256: 6dda2f421c5b8d05cb87757967e47cbbc158e24b419867646ade3573eb629a23

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/215e897159152e2f97e60e49f735acb7/86508162803.pdf In PDF document text
- https://novahealthclinic.ca/userfiles/file/5402977219.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/6c5f76163c350f72d77147090570cd4c/weleti.pdfIn PDF document text
- http://dj-venci.com/uploads/pages/files/galajutekutejepetukig.pdfIn PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08213c9665---rararex.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbad0852783---81679952985.pdfIn PDF document text
- https://summit-christian-academy.com/scauserfiles/files/75710658056.pdfIn PDF document text
- http://asustainable.com/global/file/sidamolafegovejodeb.pdfIn PDF document text
- https://sieuthigo.vn/upload/ck/files/85588873504.pdfIn PDF document text
- http://tachikawa-derma.biz/ckfinder/userfiles/files/12592398263.pdfIn PDF document text
- https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0cf53f2f81c14d90c791fdebd7bd91f9/livap.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef078cfec2---75416290225.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/58504938758.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0963d75e---rufoviwufuxet.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a588d87485ea2e3b8fb144d07d598216/vabulijefitawuma.pdfIn PDF document text
- https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/1acadb3725e662daae5ab6dbf861ca34/tazubavupiw.pdfIn PDF document text
- http://urbanconstructions.org/images/uploadedimages/file/20187678741.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a76e3555437---mefenakeguzobonotazobibi.pdfIn PDF document text
- https://africanresearchcenter.com/userfiles/file/gowetojofap.pdfIn PDF document text
- https://sikanderajam.com/Robinson/ckfinder/userfiles/files/pawarubupidaninilumanapet.pdfIn PDF document text
- https://instalacje-elektryczne.net/ckfinder/userfiles/files/dufuvirepudowixufizaxolur.pdfIn PDF document text
- http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9522501261.pdfIn PDF document text
- http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/08798184562850f4b6fba4f9dbf00d24/92665745564.pdfIn PDF document text
- http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895caaba213---fexer.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f2662632---43099234689.pdfIn PDF document text
- http://ngor2-3.com/file_media/file_image/file/16130065662.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=weakness+and+strengths+in+an+interviewPDF link annotation
- 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_off0000f109.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF109	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001091b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1091B	17072 bytes
SHA-256: `cc53be4647c27c4f6557a771f3b20658da0b2d9ab5013789a92678b5f38525fc`
`font_02_sfnt_off00013501.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13501	10600 bytes
SHA-256: `5ff955759290c26682207049c6727c7ced1f625ca13e6e864ecd70c8b104edec`

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