PDF malware analysis — malicious · c919f9b192fb2b9d

MALICIOUS

PDF

89.3 KB Created: 2021-09-05 22:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: aa28965f5783e66bc766d9d60cf5cbab SHA-1: 0f7a97ca0368cbf67956e33a702caaef73ee83e3 SHA-256: c919f9b192fb2b9d8d85abea88f04e99f2a527f812de2b8a84285a5960d52f2b

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, and exhibits characteristics of a phishing or malware distribution lure. The presence of embedded JavaScript and a large number of external links, many pointing to potentially compromised or disposable hosting, strongly suggests an intent to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/79416026771.pdf In PDF document text
- https://itexpertdog.com/upload/files/tuvotug.pdfIn PDF document text
- https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/a3o1n0krepr75p61ek9inqu67h/pevonadinevogaxezar.pdfIn PDF document text
- http://suamayin.biz/userfiles/file/7932035110.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/00ba460cb04d5fbefbb4cbb0ff394902/7377882513.pdfIn PDF document text
- http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/8lep3kagm9dlvf95hdtdn0fb7ph7pa85/rixuwosaxurudiwonabas.pdfIn PDF document text
- http://klimatyzacjaradom.pl/userfiles/file/8983780114.pdfIn PDF document text
- http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acf0804944---javogusebazuwit.pdfIn PDF document text
- https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/c5n12g154n8eoec0olc686ki52/20354782385.pdfIn PDF document text
- http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429171439950286.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f7a9e624---firow.pdfIn PDF document text
- http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210728111940661053bk4bjx.pdfIn PDF document text
- http://drapa-technika.cz/UserFiles/File/86982094166.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099ace400361---taxagibupimivewo.pdfIn PDF document text
- https://blagoustroystvo24.ru/ckfinder/userfiles/files/pobori.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66b5d78da1---35876922658.pdfIn PDF document text
- http://www.deewanalarab.com/up_imgs/85033403820.pdfIn PDF document text
- http://sms-dk.com/FileData/ckfinder/files/20210707_EFB0A7CE8AEDC309.pdfIn PDF document text
- https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/pc623a5e72of5l6c9bck0n4rnq/10512980968.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/579a0b5506ae34ed76c15dd1767f6e67/dimog.pdfIn PDF document text
- http://www.centralperdana.com/file/nugupurizev.pdfIn PDF document text
- http://mstreatmentadvances.com/userfiles/files/wanolegize.pdfIn PDF document text
- http://longarmquiltacademy.com/fckeditor/userfiles/file/45194852652.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe557b3aae3---gojokakutib.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=masculinity+as+homophobia+pdfPDF link annotation
- http://irodori.kir.jp/files/file/98208092687.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_off0000f676.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF676	11000 bytes
SHA-256: `9c01ecd0d8507ca347dbfad8a368ca7061ff412ee1478aa5eace7d86999da0e6`
`font_01_sfnt_off00010f9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F9E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000127b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127B0	18620 bytes
SHA-256: `378b8712499d1a67eb5cd2e8eed93f94f5cf37f3bc76bb304b284690add86410`

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