PDF malware analysis — malicious · 326648a07e0ac73e

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 10:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 34c7f17f4cc4aa7319c562b95978d8c9 SHA-1: fb9df5a14d33a4b68b33c6393ab85b8a21d9f702 SHA-256: 326648a07e0ac73e3c03b8a0a5aa9e7f2cb9f9567f8b667d3fd493c6299c0edb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous external PDF files, many hosted on compromised CMS upload directories. This pattern is indicative of a phishing or malware distribution campaign, where the linked PDFs likely contain malicious content or further redirection. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://kaptenhoki.com/contents//files/74726503169.pdf In PDF document text
- https://cabsfromheathrow.com/userfiles/file/32861730894.pdfIn PDF document text
- https://comobrew.com/newsite/images/user_uploads/file/11213985945.pdfIn PDF document text
- http://kleinschadenexpert.de/userfiles/file/52414315846.pdfIn PDF document text
- http://wienbildarchiv.com/upload_files/files/30744835418.pdfIn PDF document text
- http://hanboo.cn/Uploads/file/2021052018260270554.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/j9hct49kr63bt3knlmqmet6q8s/39891033115.pdfIn PDF document text
- https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078a74f3f19f---43469981066.pdfIn PDF document text
- http://runo34.ru/attachments/file/11530405934.pdfIn PDF document text
- https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160989edccc333---9509232912.pdfIn PDF document text
- https://xuanhongkhang.com/upload/files/66416894217.pdfIn PDF document text
- https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/dp0n4r68l57vpp6q8ajg12bpk7/namuli.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07ede6ebd1---80673466106.pdfIn PDF document text
- http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/53194930435.pdfIn PDF document text
- https://chameleoncoupons.com/adgprocessing/uploads/files/nelitifa.pdfIn PDF document text
- https://doublehaircenter.com/upload/ckfinder/files/zewil.pdfIn PDF document text
- https://jairdefreitas.com/ckfinder/userfiles/files/95085567304.pdfIn PDF document text
- http://dianacb.cz/userfiles/file/vutotatuminovigikomuji.pdfIn PDF document text
- http://myjobcareer.net/userfiles/file/2021060421020273499.pdfIn PDF document text
- https://bczenekar.hu/files/file/ninidamepaj.pdfIn PDF document text
- http://petersonhigh.com/clients/33446/File/4426695231.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c15098c8d8---71443630366.pdfIn PDF document text
- http://contelex.it/userfiles/files/gafewabematu.pdfIn PDF document text
- https://webshopplus.nl/app/webroot/files/userfiles/files/97119265489.pdfIn PDF document text
- http://hy-concrete.ru/d/files/lumudijog.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=thrillville+off+the+rails+mini+gamesPDF link annotation
- 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_off0000e7d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7D2	10688 bytes
SHA-256: `31983982b630d0090abd1c511b5cc5ce4250b51e8f1eb496880359ad791eff94`
`font_01_sfnt_off0001002e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1002E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011840.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11840	18368 bytes
SHA-256: `6f936c4ebfbf870fc08429d0bbea783553e0c5f03a2758fd9e013598b49ccffa`

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