PDF malware analysis — malicious · a59d7b45b572598e

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 12:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: fbe72156f0b28c92b7e5e6f9b35b5673 SHA-1: 2e686f155f9e762695f12320c5ff2d58090e0b7d SHA-256: a59d7b45b572598e71388eb97e801fad57078ec6f7e789dda1ccb3c671ecc479

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to lead users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9893

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://oniceh.ru/uplcv?utm_term=vascular+transport+system PDF link annotation
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1615229bd4a777---wupivevekiki.pdfIn PDF document text
- https://mzr-avocats.com/buddha/ckfinder/userfiles/files/vixipetepezebibovu.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c830d3cc---pujedulebudelilakevalowu.pdfIn PDF document text
- http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145bcee2d695---97195380716.pdfIn PDF document text
- https://studioconcept-stand.com/fck_userfiles/file/4085535603.pdfIn PDF document text
- https://zakazspbwatches.ru/upload/files/gukivumudanija.pdfIn PDF document text
- https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9b774917b2123501e83fd5d527e32501/94107563573.pdfIn PDF document text
- https://csodamalom.hu/files/files/45287214248.pdfIn PDF document text
- https://croatia-flyfishing.com/files/28304985561.pdfIn PDF document text
- http://aihyang.com/userfiles/file/50637711038.pdfIn PDF document text
- http://homeloanz.net/images/e/file/12500354791.pdfIn PDF document text
- https://umartravel.com/files/4229111447.pdfIn PDF document text
- http://motivationandmomentum.net/ci/userfiles/files/mafarapugojo.pdfIn PDF document text
- http://parmalab.it/userfiles/files/53306770817.pdfIn PDF document text
- http://mentor-tutor.com/newGroserLikeProject/uploads/files/gevawirofiluduvalaxaxe.pdfIn PDF document text
- https://penzion-pod-rozhlednou.cz/img/file/pusam.pdfIn PDF document text
- http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/17410337992.pdfIn PDF document text
- https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161521d3925fa8---4778689514.pdfIn PDF document text
- http://zekidilektekstil.com/images_upload/files/36433988384.pdfIn PDF document text
- http://sun-tes.ru/files/file/vovivibamasedukizod.pdfIn PDF document text
- https://ecohort.biz/userfiles/files/nujuxupedubotosesef.pdfIn PDF document text
- https://autosaloncenter.com/uploads/file/peletini.pdfIn PDF document text
- http://rollfactorytogo.com/uploads/files/jalur.pdfIn PDF document text
- http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/vejol.pdfIn PDF document text
- http://findusafranchise.com/files/files/44836355671.pdfIn PDF document text
- https://boumqueur-edition.com/upload/fckeditor/file/vejenab.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_off0000b32d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB32D	15580 bytes
SHA-256: `2d836e176c6e851c9520b05d210f288de9f892b3f362b62409d8d094ae436388`
`font_01_sfnt_off0000db29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB29	10628 bytes
SHA-256: `0ec6cd972f4d139eb08e5f50f1c50908496e6d9cbe3d537f0a6cce7d0f6df3d6`
`font_02_sfnt_off0000f38f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF38F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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