PDF malware analysis — malicious · cf42d4b709b2e162

MALICIOUS

PDF

83.8 KB Created: 2021-06-30 23:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 6bf398e1190dd71c11e3f296ad1f09a9 SHA-1: 10667a0708c0edf71e575783d6d2785ce6b4a838 SHA-256: cf42d4b709b2e162e144979f6e89d3292cafdc8b51f645f0366a85f6b45acfee

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 as a phishing trojan. The document contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://inwebjor.ru/uplcv?utm_term=factors+affecting+demand+of+a+commodity+pdf PDF link annotation
- http://nitexprofi.cz/userfiles/file/56556827037.pdfIn PDF document text
- http://melly-incendie.fr/img_db/rokosopavarobudotaduxalur.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/430aa70a8b81ec8b6b7482f41f30f9f9/garagimuson.pdfIn PDF document text
- http://kingcraftviet.com/uploads/ckfinder/files/34265772276.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099cf0cbdd7c---85766451485.pdfIn PDF document text
- http://www.gesas.it/media/mailinglist/file/75879559146.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb844aaaabe---43851623815.pdfIn PDF document text
- http://aep-tc.com/cache/fck_files/file/befex.pdfIn PDF document text
- http://mhinflatable.com/upload/file/woparabowaxumasip.pdfIn PDF document text
- http://alexanderkanevskyartistbiography.com/clientMedia/file/68760665066.pdfIn PDF document text
- https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/e87d1b58d3b9339071666370666f0be2/65154309386.pdfIn PDF document text
- https://terlickodds.cz/www/www/fckphotos/file/pevuxirotikewa.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a721468cd56---62931230856.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d35256674a11318c2487f249486a825c/94624652036.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f0e5a4f0cffda1ee58e71355610eba88/51276408797.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6feeef1a0a74654827e3e7bd0be5a490/46220819994.pdfIn PDF document text
- https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/kl4tvjkjdtcemnsnd055oa5tcf/rasit.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/95d12148ddbac3375917d5c234faa558/dojomumowi.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4072454e47---27533704937.pdfIn PDF document text
- http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052fb7f1e4---gudigekojimeveradofobakeb.pdfIn PDF document text
- https://tsegypt.com/file/gejipa.pdfIn PDF document text
- http://sity-luxe.ru/userfiles/file/37446023702.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fd99db907---befawamowasexevidewevax.pdfIn PDF document text
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f77115007---78897797990.pdfIn PDF document text
- https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/03a2fa811fd7293c1cef15c9fcd0941b/gulikudomar.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_off0000e73c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE73C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ff4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF4E	16020 bytes
SHA-256: `8b262c5044b96b3e40afdd44c97cd7d3bd203ef6885b273e87fba9c136583895`
`font_02_sfnt_off0001285d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1285D	11008 bytes
SHA-256: `b1caafe15161dec37ed559c276f1c06377cba2b1436ee4397514fa4dedd52fcd`

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