PDF malware analysis — malicious · 26341874da4780bb

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 19:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 2f5b11313a307c5bc8222f80cc61d26b SHA-1: 28478bb988d872a2fb7e1de3fb3f4d30fd2f9eba SHA-256: 26341874da4780bb20d0c10ce3959e238c8cd5880fbaa49e08cca866e2ad67d3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of compromised CMS upload links further supports the malicious nature of the document.

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=ty+france+padres PDF link annotation
- https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/dme04vj1c4qmt1mk3sde75rv8l/11763198312.pdfIn PDF document text
- https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/vkpbt0n99mhnfneu3um6c2dj74/12072463958.pdfIn PDF document text
- http://ruresept.ru/files/file/22427727646.pdfIn PDF document text
- https://sjalikave.hu/pictures/file/nezipen.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086a8f40093b---xifopexanegewufolegid.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc79e772bd---39679987623.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2c4eb46a---josemolisilebubajun.pdfIn PDF document text
- http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/nukimekegukukagozajap.pdfIn PDF document text
- https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/75bbe6034ec5ce5d1df6a8883e8abee0/bevifezanorusiwipub.pdfIn PDF document text
- https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/88c5996c73bcb60b4e57dd028066b7b5/76555644032.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f30d1490c---58601613006.pdfIn PDF document text
- https://latework.cz/soubory/79904661001.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb8e9cff3---2865955110.pdfIn PDF document text
- http://meruzhankhachatryan.com/app/webroot/files/file/rofularolomafe.pdfIn PDF document text
- https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b48e392adab992894340abc9c698a5e8/73595523745.pdfIn PDF document text
- http://khiconghoixuancong.com/Khicong/admin/userfiles/file/2180072436.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bddad36e7c0---juzewovebimubipisadin.pdfIn PDF document text
- http://artkulinaria.pl/sites/default/files/file/wositone.pdfIn PDF document text
- https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffa042498---34340671086.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7703dc6d25---73000460791.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9c4e8727b---18803179355.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a138e43ce77---557409199.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2602349b00e3ec8cea5687ba321ef454/mofelezorimiv.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9d2852116f79b2be04139349acdaac5b/91408558309.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2df346a9---39728461457.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_off0000f9aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9AA	17792 bytes
SHA-256: `e4727acbd53c1b8038cc90c29e6bf4628cae3f9ed021ddc8cd78f9e7e2fa5810`
`font_01_sfnt_off00012801.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12801	10332 bytes
SHA-256: `3965cdc053dc316d5ec76378616254ba6f44f96c7e9294f1ed4c50f3fde6c2c5`
`font_02_sfnt_off00013f73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F73	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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