PDF malware analysis — malicious · afd2b2715b582e72

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 19:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3d6e9c0268ea58b267ffab344d1b3fdf SHA-1: 0e663caa4a34557be28b8864c73028d1e17331c3 SHA-256: afd2b2715b582e7246bb4ca6f1a1896a8cb766ce3eb6cf98253fbef1ef0a8a51

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the detection suggests it's likely a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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://pistant.ru/uplcv?utm_term=hacker+photo+editor+apk PDF link annotation
- http://studio70.eu/userfiles/files/49853425197.pdfIn PDF document text
- https://magnanerie-cazilhac.com/userfiles/file/nozugekazitevigesiga.pdfIn PDF document text
- http://sapientgenerator.ru/files/userfiles/files/70194363944.pdfIn PDF document text
- http://giaexploring.it/userfiles/files/zijunobotiladejibipikad.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f9f253c---48161592657.pdfIn PDF document text
- http://zzfcw.com/file/fkimg/file/kudepabuzajudu.pdfIn PDF document text
- http://capmar.eu/userfiles/file/sipuxiwaj.pdfIn PDF document text
- http://pickup-ws.com/userfiles/files/43083784949.pdfIn PDF document text
- http://nissanotogovap.com/uploads/images/files/5525578533.pdfIn PDF document text
- http://cafehinglung.com/uploads/files/mapulizabukigirudativuk.pdfIn PDF document text
- http://fujieshubao.com/zk/UploadFile/file/2021090113035073499.pdfIn PDF document text
- http://om-ar.com/userfiles/file/famibot.pdfIn PDF document text
- http://tuanayapim.com/rsm/files/75059869339.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4b81b39f---serotudikedevibevu.pdfIn PDF document text
- https://samuelben-horin.com/userfiles/file/95187628119.pdfIn PDF document text
- http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130420c3fceb---68691793746.pdfIn PDF document text
- http://thewellmanteam.com/userfiles/files/13549387304.pdfIn PDF document text
- https://www.auto-ecole-acm.com/ckfinder/userfiles/files/81300404413.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_off0000cc40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC40	18884 bytes
SHA-256: `031ea1bcb8d7566a8efaffd1f3215772d94db30b6471b6625d13a6d27281cfbe`
`font_01_sfnt_off0000fe1c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE1C	10376 bytes
SHA-256: `ae0831d043db2c41dbb083ca1aa73d6177cfc7cedd90d4af92b7916553b91723`
`font_02_sfnt_off000115ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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