PDF malware analysis — malicious · 59d2e5bbb04955f0

MALICIOUS

PDF

89.7 KB Created: 2021-06-29 04:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 33f4392723542a101289533e6a28fc60 SHA-1: 017631af753b70f75b06bf493f2b484ddd813562 SHA-256: 59d2e5bbb04955f0a593ea3afd3ecf283410f0714acb40ab8d330b28e8e6b09a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress upload directories or disposable hosting. The embedded URLs suggest a phishing or credential harvesting attempt, potentially disguised as a document delivery service.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://crysiq.ru/uplcv?utm_term=how+to+send+pdf+book+to+kindle PDF link annotation
- https://maconlux.lu/userfiles/files/48117364943.pdfIn PDF document text
- https://collegemahan.ir/basefile/collegemahanir/files/91728810395.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b291dd93b1d---mosemifefegezazekekotup.pdfIn PDF document text
- http://ecandrychow.pl/Image/files/tunajatifojuvuxugipip.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607221e9bce48---34374256655.pdfIn PDF document text
- https://mtmnetwork.net/uploadEditor/files/netakolifagakewu.pdfIn PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/rktk96u9bv3hf8qa75uudf2o94/77847570354.pdfIn PDF document text
- http://creativeindustries.ru/uploads/userfiles/file/topilevojuzamitabuzuz.pdfIn PDF document text
- https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/c9b6db88988263b409a787c2c2adffba/93939919453.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a784c3078---82792668937.pdfIn PDF document text
- http://am-assets.com/aom/magnolia/userfiles/file/7920353563.pdfIn PDF document text
- http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/87551791472.pdfIn PDF document text
- https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607059bd28f4a---dizemevi.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3972331d6---jebew.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160740c9e11b79---weguxujuja.pdfIn PDF document text
- http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ced0193ac---susuji.pdfIn PDF document text
- https://brod-plovdiv.com/images/tejadamegifizuzabu.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f0f89191ef31126c5b8bf04939286e63/52999508890.pdfIn PDF document text
- http://banglatalkies.com/dynamic-images/cms/file/fajikikosajazatufemaj.pdfIn PDF document text
- https://detectiveoffice.net/userfiles/file/xofefopatufaxikusunu.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1acc9bb31---wivipodomosojuduxa.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/97508407886.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1db35090beccffb26a0ae314c80616b4/92894740233.pdfIn PDF document text
- https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/daa3e2fe8a4a2c6abac4d538c5ea3333/85901019335.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2e0ab40c---88165445798.pdfIn PDF document text
- https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160743972c1740---bodukimatogakubaw.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_off0000f79d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF79D	18240 bytes
SHA-256: `40e7819544ee8282db0d5b30c0ccbe747751686f56898b07a883e9037f01fcd9`
`font_01_sfnt_off000127be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127BE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013fd5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FD5	10540 bytes
SHA-256: `e5bb9c20f8d4f10d483bd92be25c352e32d5cc53d2457828de261bccd0567c82`

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