PDF malware analysis — malicious · e3ec6c06ca969467

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 11:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 6fa2a28915038b33c0958ac8c0d1d815 SHA-1: 4afb8c0405b3a08db4dc20ce8dfab951a5c7d39a SHA-256: e3ec6c06ca9694677c7883c649649c1e46eb71c2f47a4e39dfe10800a7960cce

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate phishing or malware distribution. The presence of a 'download' button lure further supports the conclusion that the document is designed to trick users into downloading a malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://synerhu.ru/uplcv?utm_term=avs+video+converter+9.0+free+download PDF link annotation
- http://clinton.abwingsmd.com/uploads/files/35908158491.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3966182fa---jigojizovivumanasuxule.pdfIn PDF document text
- https://forumsevens.com/images/file/relidebid.pdfIn PDF document text
- http://ukwoodrecycling.com/userfiles/files/navutakulifutorokufa.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/408bd8f4d2c68026d338d2650810b2b3/wesenibu.pdfIn PDF document text
- https://habibitours.net/ckfinder/userfiles/files/79776974774.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5cb5bcfdcf2e2708ae169c089b6ff891/xefudowarajodap.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a89e1b18---47416220148.pdfIn PDF document text
- http://izumrud38.com/ckfinder/userfiles/files/vebonabuxagaravikalazi.pdfIn PDF document text
- https://benqmusicworkshop.com/fupload/file/dosaniwomalekazufi.pdfIn PDF document text
- https://oriental-kitchens.com/userfiles/files/kigoparekaxonale.pdfIn PDF document text
- https://falconshipping-uae.com/userfiles/files/regilisiduraxa.pdfIn PDF document text
- https://f2h63c2.ip4secure.net/upload/files/94820203029.pdfIn PDF document text
- https://siahotel.com/userfiles/files/beduwoneralixas.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/xexim.pdfIn PDF document text
- http://sb-78.ru/files/file/88594023191.pdfIn PDF document text
- http://blankheich.de/images/uploads/file/lutonezolerama.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3977578c4be41b2c3fa886be4472bcc6/16721279916.pdfIn PDF document text
- http://mamitobe.ru/files/file/90987509871.pdfIn PDF document text
- https://www.tocbirsen.org.tr/ckfinder/userfiles/files/fijamiwekawi.pdfIn PDF document text
- http://blbr365.com/userfiles/file/1632266817.pdfIn PDF document text
- http://cargologicru.com/sadm_files/tovuvamal.pdfIn PDF document text
- https://dnmpaint.com/sdcc/images/file/57965053667.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_off0000e10a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE10A	17144 bytes
SHA-256: `e060a8c90e91832b2ff27d7e35a63afb7dc19d6f72d31282520cc79cf74e8474`
`font_01_sfnt_off00010d8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D8D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000125a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125A4	10960 bytes
SHA-256: `49e94561c90d384cfb2904a5ed7588ac43619011e80daa59e3ae67c2abee17c8`

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