PDF malware analysis — malicious · 6529fbb81782335d

MALICIOUS

PDF

86.6 KB Created: 2021-07-04 22:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 6324e1329e5727fce0ba47b8177ceadc SHA-1: f2b1af9790437e5a2b575770fda19487d6800c7d SHA-256: 6529fbb81782335dbc87b82e5e5e40e33697d8826f24f0e0b91f395c989a158b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers identified the PDF as malicious, specifically flagging it as a phishing trojan. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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 http://bioscipublisher.com/files/upfiles/file/pexadedupakopu.pdf In PDF document text
- http://stellar.ru/ckfinder/userfiles/files/49304239808.pdfIn PDF document text
- https://triosms.com/userfiles/file/digavajidimin.pdfIn PDF document text
- http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2a234e9cc914ba4e8a6c8fef5821bd11/90558059290.pdfIn PDF document text
- https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b630895ebc5---motimiroxifon.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607568fb0df94---61404463759.pdfIn PDF document text
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6dacd326d---fepenajunoxenodo.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/a16d6cdefdfe194819eea9cc42ee745c/27496695893.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608b826578531---87306586990.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e347e8be8---mowojesibapafepode.pdfIn PDF document text
- https://telewebmarketing.com/FCKeditor/file/zonokuzijotal.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2df461a61---47102123485.pdfIn PDF document text
- https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/27503d4a3d41d370ff1153219cd3561a/23491998163.pdfIn PDF document text
- https://abugfreemind.com/userfiles/file/89048809536.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/07prk7cleimhpfe5f0simeic3q/92917054859.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1edb3df4d---88988652414.pdfIn PDF document text
- http://longarmquiltacademy.net/fckeditor/userfiles/file/lemetizixage.pdfIn PDF document text
- http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2441efb7f---soxawasalusegowetesibeb.pdfIn PDF document text
- http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/26996657090.pdfIn PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071a811b5e55---maxotapemonasuzobapuk.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b953825ec9---21582422331.pdfIn PDF document text
- https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c1348b1bc---kivuzunuretoso.pdfIn PDF document text
- https://banderlogclub.ru/Files/file/99187575914.pdfIn PDF document text
- https://bnovum.hu/downloads/7312820392.pdfIn PDF document text
- http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc55d272f---99712894976.pdfIn PDF document text
- https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/00601508f634021359040993a35c8fb2/liriwizozomaserebuwi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=technology+words+that+start+with+lPDF 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_off0000eeef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEEF	17168 bytes
SHA-256: `73e5000be9f1a1c7029d328dcd026d0f1f5508d84ff93c7de2bb5899a2bbfe03`
`font_01_sfnt_off00011bf6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BF6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001340d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1340D	10812 bytes
SHA-256: `cf9c99fef5300a1f4072d0a808a8e3210da673ac62ab80f4d7bcc5027953942f`

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