PDF malware analysis — malicious · 1bd42e9c0d6cf50f

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 02:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 085b1a39416acb24976157b462e877d2 SHA-1: 734e2fb6b2f0cfb8cd6a3e2c2226238918ff6b16 SHA-256: 1bd42e9c0d6cf50f5b8c157ff501c98a31746b2aa0368604221ec8eeed3d7536

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the presence of multiple external links and the 'link farm' heuristic strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=guy+fawkes+and+bonfire+night PDF link annotation
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9d66b046---piguluxoxudunoludukusimi.pdfIn PDF document text
- http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8bd55749b---likutepejuju.pdfIn PDF document text
- http://diversecityuk.com/userfiles/file/kozagibexelofogifizoja.pdfIn PDF document text
- https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b64723623bfb14df3dd1dec716358756/90824110922.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6c0d60c1be63dc13c1350722bf842c73/48500634098.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c271eb96049---61784816033.pdfIn PDF document text
- https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cec2b8db8f---30170589596.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0433f52d9cfd501dcb55442fb9b8e4cf/komaleritudikominijagisev.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b15930ed---98114144801.pdfIn PDF document text
- http://solamsys.com/userData/board/file/bamimufuw.pdfIn PDF document text
- https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/de67487287e0a73490e6a0b70ccb6490/58375419885.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/218df9ca2c84b5f0a1c02da716f41c6c/49814840607.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae216a3400f---kiwopusipekedovak.pdfIn PDF document text
- https://doucetplasticsurgery.com/ckfinder/userfiles/files/46493094837.pdfIn PDF document text
- https://capecoralliving.com/media/file/17561759352.pdfIn PDF document text
- http://phrabat.net/UserFiles/File/55751515579.pdfIn PDF document text
- https://faresaldabbous.com/uploads/files/debigozafejibige.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a818f73807---70641477015.pdfIn PDF document text
- http://www.hmcpacking.com/uploads/files/43536227377.pdfIn PDF document text
- https://sambelteri.com/contents//files/59477995551.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6orgga87t0aqscs158tg45mci6/97143761535.pdfIn PDF document text
- https://blugarden.eu/file/98152062738.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9361a155---11277302603.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a9ebf7d7---94874890788.pdfIn PDF document text
- https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/v244o71fn1q54m9fdrog4v0l70/tipij.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_off0000f275.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF275	18724 bytes
SHA-256: `4e271f86119caed77649e7433a27923d5bf127b9dad78f6cca940a3585f5a8cc`
`font_01_sfnt_off000121af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121AF	11160 bytes
SHA-256: `cdbfdab1e33720656932570c43acfde18d426b4612853f239e1a133315978a73`
`font_02_sfnt_off00013ba9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BA9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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