PDF malware analysis — malicious · 408a6b3bf5adb883

MALICIOUS

PDF

88.8 KB Created: 2021-07-08 03:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 521f455e678792b49167359f75901aae SHA-1: fcfd1ef40cd6c325fcc94e862ef2d4b87d346a0a SHA-256: 408a6b3bf5adb88399e54cd457ae6e2f0254ffd12d890f45faf8efbf7bc13759

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

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://coretry.ru/uplcv?utm_term=s1+stereo+shuffler+free+download PDF link annotation
- https://ilcaminodaugo.it/file/nosugibujibad.pdfIn PDF document text
- http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/66ebfd55ebddd0c851152dfb937d4d60/duzoj.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f94cc97b4---lojidivafitulefawaleton.pdfIn PDF document text
- http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/fupitufifa.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f4874511c---doliwopewivepus.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3ff93ae4e44c40f4c960251e5b60f881/77315930061.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4c146a84---86813631587.pdfIn PDF document text
- https://foundryindia.org/userfiles/file/safopamikifetepibiruxova.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/did4c2t98kiaisg4qpj4v84l5q/84247042600.pdfIn PDF document text
- http://jshtextile.com/UserFiles/file///biwifo.pdfIn PDF document text
- http://location-appartement-venise.com/italie_documents/files/xafefosivuxa.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b3b9cbd98---82341067027.pdfIn PDF document text
- http://immopolignano.lu/images/wezimezixexiv.pdfIn PDF document text
- http://shuswapladystriders.ca/userfiles/file/gemoxilatelex.pdfIn PDF document text
- https://ancoraeducacion.com/images/13118317735.pdfIn PDF document text
- https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d957aeb6ff---sabuxurojisujotaxarubak.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2040659ed6---lekobixepizopa.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800a3d3d1a7---19412700549.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/f9mslrciru7jtkpt9ts3g5ifph/gokojemuvopurowiwufesug.pdfIn PDF document text
- https://arte-salon.ru/upload_picture/waxoje.pdfIn PDF document text
- https://anpheatingandac.com/nbloom/fckuploads/file/37207521361.pdfIn PDF document text
- http://kayapaliinsaat.net/file/35771425391.pdfIn PDF document text
- https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0af0859ef57da3f4978d0dbe344d488b/77061789776.pdfIn PDF document text
- http://hutergroup.de/userfiles/file/58177458709.pdfIn PDF document text
- https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b571d219b---90706962458.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_off0000f84d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF84D	10672 bytes
SHA-256: `95fe4e9dba11312696f687b6bc411f1ab290745066e69dadcc322056a88d9dbe`
`font_01_sfnt_off000110d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110D6	17248 bytes
SHA-256: `9a6327045d8b5d6fadff50ea77b0c23376e7d88ae33ec0813a0a16a0d91b3fdf`
`font_02_sfnt_off00013dc1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DC1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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