PDF malware analysis — malicious · 71a59d5b53158d18

MALICIOUS

PDF

74.8 KB Created: 2021-06-08 15:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 3a409bcf2f0200782dc6cf4acf9dd872 SHA-1: a6b5ae1c25ccad663496578b628a705659d6bec6 SHA-256: 71a59d5b53158d18db4e55eb6c2390339fdb9b99540dca69d2e7f1f551173fca

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=percentage+increase+and+decrease+worksheet+pdf PDF link annotation
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/042b172908343604a5b73b618fb38d8b/masalewotuzuvavunidi.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bb624172df73987826fbdc17e7c52684/nawigarekusubetu.pdfIn PDF document text
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a45b96c0d0eb89a43de8c1520e3e2a7c/41274503154.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d83b188ca---14968687622.pdfIn PDF document text
- https://davaocarrental.com/images/file/79424751620.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24134a1d3c---49493654070.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743eae6efed---nikifularesupuxogud.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dead6d69daa669f8ae9210ed62319dac/pakideresineguzinibiro.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088400c69648---59521750794.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082e007e3370---98886988776.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e37763e6---10076669885.pdfIn PDF document text
- https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7fb1680d3---14817472414.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711826f207b---80849843856.pdfIn PDF document text
- https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d9c670638958b8684ee3d3de7ca61359/rixitidulasagavozewowi.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc63b03aea---33728854315.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d121439fe---dupulenumuvuda.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000ced7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCED7	5540 bytes
SHA-256: `216f58fe9a083c4c5604638b72cd9a71ea943d08733bbaa51f733ac4f171baca`
`font_01_sfnt_off0000e1bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1BF	11556 bytes
SHA-256: `b1a2516fe9012f4520a590162f6e742dd2bf6a07e7dcbb9853ec4993c20720e4`
`font_02_sfnt_off000108e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108E5	16092 bytes
SHA-256: `39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67`

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