PDF malware analysis — malicious · 7ab59d914ea99444

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 03:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: adb7c01b1f4620eba6490b714e738260 SHA-1: 548c3ff39e5f70636eb26e3be50cb195e342ca1a SHA-256: 7ab59d914ea99444062f9acdfcaeac271439776a8da4f4bdab0aa2a58e3f7e64

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into visiting these sites, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=dti+registration+form+pdf PDF link annotation
- http://travelspace.pl/userfiles/file/92767811104.pdfIn PDF document text
- https://rlmahtani.com/userfiles/files/mifipalezivurunukip.pdfIn PDF document text
- https://777mto.com/contents//files/64571091928.pdfIn PDF document text
- https://ourlady-schools2.com/userfiles/files/70536355451.pdfIn PDF document text
- https://pepinieramontana.ro/ckfinder/userfiles/files/pavosoxikopunipeg.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fbff61b18---wobudurelejajito.pdfIn PDF document text
- http://vector-luczak.pl/new/fck_user_files/file/tonidumonap.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080dc1fc7431---9690111950.pdfIn PDF document text
- http://baggiez.net/userfiles/file/9156958096.pdfIn PDF document text
- http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/5560503574.pdfIn PDF document text
- http://nousgarage.com/userfiles/file/vajavarirofikuvukuw.pdfIn PDF document text
- https://otoform.com/upload/ckfinder/files/8651819726.pdfIn PDF document text
- http://fishtech.org/uploads/userfiles/file/file/78413804543.pdfIn PDF document text
- http://eaas-journal.org/survey/userfiles/files/jatojowak.pdfIn PDF document text
- http://kirakuramenandsushi.com/uploads/files/41397905260.pdfIn PDF document text
- http://hondasushi.com/uploads/files/26745395751.pdfIn PDF document text
- https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/6p2qn77s33g0qv5iee3e8ncu2u/fiwomamosejakidunutitoj.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc40907beff---56598298178.pdfIn PDF document text
- https://aventura-agence.lu/userfiles/files/ravegadolikuduw.pdfIn PDF document text
- http://phuquytravel.com/nguyenvanlinh/files/24320665067.pdfIn PDF document text
- http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de723e5998d---xesuzekewozogisi.pdfIn PDF document text
- https://www.verimevzabavu.cz/ckfinder/userfiles/files/25623883953.pdfIn PDF document text
- https://tonere.shop/app/webroot/files/userfiles/files/58146852333.pdfIn PDF document text
- https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/7m5cq0d4665ohkho1r4fkt0dd7/wasikenazujosax.pdfIn PDF document text
- http://siciny.pl/userfiles/file/muxifujikijatuzelivela.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_off0000b748.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB748	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cf5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF5F	10796 bytes
SHA-256: `883b55fe742f215782f5f2081de27ec76d56eeef0bb004e0d92a01247da0fb21`
`font_02_sfnt_off0000e803.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE803	16856 bytes
SHA-256: `6a61ffd69603602d61906e83d3103b839050a267b00c6cd01a222903e2d1c6fd`

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