PDF malware analysis — malicious · 86d927a74f1f8203

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 10:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: e6a4036087d651e71f337c5e893c19c7 SHA-1: b5607c0e767ac04ae7b0ac2686aff0ea39f0176b SHA-256: 86d927a74f1f8203ab96674c174db08bd619b46c65cb1b1a834c51b6118f5b6b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Static analysis revealed that the document functions as a link farm, containing numerous URLs pointing to external resources. Several of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting an intent to lure users to potentially malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://bezpiecznamlodosc.org/files/file/geletemovimulobedalak.pdf In PDF document text
- http://ipsgroupjjn.org/userfiles/file/21793655772.pdfIn PDF document text
- https://tarsiman.ee/files/file/53000247119.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b799b71e09---livosajatixatavosilenuxug.pdfIn PDF document text
- http://crosswaysrecruitment.com/userfiles/file/wekijezakuvazosurugon.pdfIn PDF document text
- https://solelane.com/ckfinder/userfiles/files/40266588369.pdfIn PDF document text
- https://innotek.vn/uploads/news_file/66749556063.pdfIn PDF document text
- http://artgrafika.cz/userfiles/file/zekizazolinafem.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/btvvv8iu2qiukpa6l39lj9gp66/lazapawovuruzafama.pdfIn PDF document text
- https://www.esfa.bg/root/ckfinder/userfiles/files/lalutulabako.pdfIn PDF document text
- https://associazionedynamica.it/uploads/file/vofivedutadifumatatosol.pdfIn PDF document text
- http://kennycojewelry.com/userfiles/files/202109/1630934977.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8475eeb8---4354773327.pdfIn PDF document text
- https://healthtecindia.com/userfiles/file/81369124088.pdfIn PDF document text
- https://producto.works/userfiles/file/89941411741.pdfIn PDF document text
- https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d7571dcfbd36c9a0f18eeba498f43d2e/15174596865.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c663490390---pipesitiwujadujovujuxix.pdfIn PDF document text
- https://skiclubraonbaccarat.fr/pdf/pomalafafufirigizef.pdfIn PDF document text
- http://amandatravel.com/userfiles/file/vegixeso.pdfIn PDF document text
- http://konsultacjenaukowe.eu/Upload/file/1504324060.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dc18c22df0056763d0d774b5fdcbd38d/48307891622.pdfIn PDF document text
- http://projecthouse.bg/uploads/CKfinder/files/mapige.pdfIn PDF document text
- https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/29708424974.pdfIn PDF document text
- http://transbur.ru/admin/ckfinder/userfiles/files/najilakikudiwe.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+crime+boss+moviePDF 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_off0000caf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAF9	10252 bytes
SHA-256: `ff8e9fcb9ab4ab2ad4509807eb1ab8b63398eaa4da3e1996f4595abe83aeb9d5`
`font_01_sfnt_off0000e205.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE205	19372 bytes
SHA-256: `30022e60217910c2f7fb8bf68642514ec85a7d128ef54345bd971cb8f240acba`
`font_02_sfnt_off0001132a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1132A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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