PDF malware analysis — malicious · 2613ea3fdac4af04

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 20:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: b3e8847b64475fba74d4dfdd5322691c SHA-1: 4dff2ff69eba63c5f178685c66b36c6c1bbf0bc1 SHA-256: 2613ea3fdac4af045cf554fbcbc0314cda9580247a80831d5278ae6de829b4ad

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to compromised WordPress sites, acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially track user engagement with the malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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 https://infrive.ru/uplcv?utm_term=codenames+2+player+rules PDF link annotation
- https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/38daue9jdkv30cl9qkpr9sqot3/13339381785.pdfIn PDF document text
- https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1ff51b07edb30b8c373f9dbfb14be86a/24946080225.pdfIn PDF document text
- http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/19135890936.pdfIn PDF document text
- https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5677f53fbb8045d7764e6a9933d802b3/xegazosawemaguwusapipaz.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/spq24jqvmgde58kplo85qqbt01/sixubasewiridikutomububex.pdfIn PDF document text
- http://dilimkebab.com/userfiles/file/58192049599.pdfIn PDF document text
- https://mangonebike.com/uploads/file/91063785829.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vhv17hfvccg6j6m9nrs811oh9a/bopizelanularebivokonel.pdfIn PDF document text
- https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/597dcba3478e146a456629b8bc4977fa/63083076533.pdfIn PDF document text
- http://quickvideo.nl/userfiles/file/94314975831.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2ad4b3ff58460d78f367f29d8c1401a6/wawekof.pdfIn PDF document text
- http://imhkayseri.com/resimler/files/buvelevunigaxaruxiwa.pdfIn PDF document text
- http://timandlor.com/userfiles/file/59173951256.pdfIn PDF document text
- https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/6nhh7g4pmvinqc0f8tcp6acoi2/vamemakubirogexin.pdfIn PDF document text
- http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ba2b0479---berorepenavelotodemurivab.pdfIn PDF document text
- https://mabuksusu.com/contents//files/wipubano.pdfIn PDF document text
- http://jpind.pl/userfiles/file/64138505477.pdfIn PDF document text
- http://househouse.it/userfiles/files/26220570929.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094209f188d6---42858258639.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d8bc5d3cb---lodupipabepu.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1b1e81e4b0dc04ee3270496ca66a1bed/78197134666.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c984ae50217---89996555935.pdfIn PDF document text
- http://buergerforum-tirol.at/file/vipanunojonuzegubiluxor.pdfIn PDF document text
- http://insureacompany.com/userfiles/file/jivemejudovilonilonigamo.pdfIn PDF document text
- http://janyska.home.pl/_mjanyska2013/fotki/file/vutom.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_off0000edc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDC4	16888 bytes
SHA-256: `ee5f01795dc055aff6515936df85ee64c9091958964f791624fb02813bcc42ba`
`font_01_sfnt_off00011963.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11963	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001317a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1317A	10728 bytes
SHA-256: `874395195e03a2326108d39bbd0c56019205f7f110c942b846b7d21d8e2a43af`

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