PDF malware analysis — malicious · b60187f2a865a081

MALICIOUS

PDF

83.1 KB Created: 2021-06-28 07:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: cda3e615edc7235eb277c713188764d9 SHA-1: 7b4af85b9d763f6cc11959a597650411ccefec9e SHA-256: b60187f2a865a08140ef6f27da4f16c4fec4b0bd88545f41fc7049bddedd0fef

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs indicate it is likely used as a lure to deliver further malicious payloads or conduct phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://archism.ru/uplcv?utm_term=along+the+street PDF link annotation
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a1e9ff43bb841f5bbfa5b36bf32082cd/68628704709.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hfj8hl9ajmk3fmhodnnclvg3m4/fovoziroduvufoloxi.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8645065f6---jirudelekamizikajeni.pdfIn PDF document text
- http://alnoorcity.com/userfiles/file/77705870994.pdfIn PDF document text
- http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/1q31ob3uiion4cgdoq95tdcho2/73094408680.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a50e702a473fe1e795db0fd6422508a0/zegalijogezowajujovaba.pdfIn PDF document text
- https://plasy.com/uploads/file/jazawunumenogubud.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088990cbf458---50316188370.pdfIn PDF document text
- https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7btb41oveda5nredv9k05790nr/55150624839.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9f0c4cfa8---91239212417.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608afd1023130---bidube.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ccidracoho7p522d6tmdko9rh7/zaseloraxozabejudoki.pdfIn PDF document text
- http://ahcxdq.com/uploads/file/290949012928.pdfIn PDF document text
- http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a7db4781778---12477277238.pdfIn PDF document text
- http://ongnuocdenhat.com/upload/files/61935735299.pdfIn PDF document text
- https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac54c910583---talasiginotubapigu.pdfIn PDF document text
- http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/thf95fiiu3lc2ism1ushatk5q4/sifowebo.pdfIn PDF document text
- http://ajtoablakcentrum.com/_user/file/10894184263.pdfIn PDF document text
- https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed1685918d---wutogoz.pdfIn PDF document text
- https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf62cb7e9---lemokaponanotegawavekum.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3981c64c1---8480812141.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160798f4496915---41665343765.pdfIn PDF document text
- https://bluetact.com/ckfinder/userfiles/files/50499839787.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/31accbd598647484828cd78ef7e4fac8/nerofinawovegumemab.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9430f6effd1271a13acfd2006abdc8f1/50107810464.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8eb226485---28886745802.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_off0000e1b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1B9	17928 bytes
SHA-256: `afbd864a88805fca0d383a65a3232d7202ecadfe8f90ee27103632cf85ebb855`
`font_01_sfnt_off00011043.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11043	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001285a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1285A	10116 bytes
SHA-256: `c6994c40217bd038e28731623a1ab8382f6d25daee024eeb1c72cbe95d005231`

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