PDF malware analysis — malicious · 7e430c39590dada1

MALICIOUS

PDF

88.1 KB Created: 2021-07-06 19:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: b105163c6186ba1fb96fb39715d70201 SHA-1: daa2683324147e8faf16347a1efd2f35d3d18399 SHA-256: 7e430c39590dada1464432c759e046b05478a8c078a26b3edba9e7ed62156332

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the presence of multiple external URIs and the overall heuristic profile strongly indicate a phishing or malware distribution vector.

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://krisoc.ru/uplcv?utm_term=two+point+perspective+exterior+drawing PDF link annotation
- https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8b80428e72256b5390481b41b14d22da/62959894128.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f4765de27c90390252577a7cc77e7210/45235938984.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aaab3ef15---semil.pdfIn PDF document text
- https://locktactyuma.com/ckfinder/userfiles/files/36323843286.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/e7jvtffieudu5gjeo7c2aqp0b5/46880448027.pdfIn PDF document text
- http://rasmesafar.net/basefile/basefiles/52734946840.pdfIn PDF document text
- http://amon-syotengai.com/userfiles/file/raxavodixelirijatipe.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/94c3989a6b37651824ac8abbe14d18e0/xavef.pdfIn PDF document text
- http://sowitech.vn/upload/files/rimamerolivozus.pdfIn PDF document text
- http://pamat.ro/UserFiles/file/fezotesikurubelekezabit.pdfIn PDF document text
- http://pressvaluation.net/userfiles/file/pibatuxaraz.pdfIn PDF document text
- http://grandp.ru/userfiles/file/83596311517.pdfIn PDF document text
- http://okmarin.ru/userfiles/file/20487097566.pdfIn PDF document text
- https://cambodiadriverservice.com/userfiles/file/bigeki.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/54e529545884bcdbf83769cebc2e327e/keborudubobago.pdfIn PDF document text
- https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/qvq4u6sjuhsmi49rp0f9ds8v8b/27869846349.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/13b6e88e0229da83663dba16d9856f19/koreluseganotur.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d403e18a3b1---98490830484.pdfIn PDF document text
- https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/q27pfi15rjpose64oile6l082c/sisosoxevitagage.pdfIn PDF document text
- http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/bosezafakujarepepavogu.pdfIn PDF document text
- http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087473150e59---pekenesofo.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f044d0675---73182845666.pdfIn PDF document text
- https://balbok.net/admin/ckfinder/userfiles/files/11175441456.pdfIn PDF document text
- https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7c36bb1e50abcac32215e2aa441550b2/muladigivumipixunub.pdfIn PDF document text
- https://heks-tech.com/app/webroot/userfiles/files/85163957558.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_off0000f5ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5AB	16764 bytes
SHA-256: `d15d0d82b23e18e59531afcd7bd69376ebb21f57e1c1c7d2e6329457f57afaa6`
`font_01_sfnt_off00012182.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12182	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013999.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13999	10860 bytes
SHA-256: `3bf27913657a31a4bed6c17edcac175980f47aed676def4edfd86a5521d6a099`

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