PDF malware analysis — malicious · 4f4657936ce5fc21

MALICIOUS

PDF

74.0 KB Created: 2021-07-09 12:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: b85eba26425de9780ee27f0e106be8a7 SHA-1: bf17846025c22a54829c05cf2ba08a7f4e513deb SHA-256: 4f4657936ce5fc216843c619787c78bc887a1f8d49861bbe562e8c5e27980ddc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://cructi.ru/uplcv?utm_term=how+to+draw+a+solar+eclipse PDF link annotation
- http://conblocmanado.com/pics/file/ramusorufuzopexi.pdfIn PDF document text
- https://autotrans911.com/thread/admin/uploads/file/84888423271.pdfIn PDF document text
- http://chretkinia.pl/userfiles/file/63629855170.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092e5b98ca41---66016582813.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/opbbanlv6c2kv217j6s8f4blh2/kagorisetelowisas.pdfIn PDF document text
- https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f0a7b75e9b72520fb30ae2aab122523a/24167246480.pdfIn PDF document text
- https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/77fc4968863c9217ac360bd44206c975/38890153547.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994c47380f3---turebedewidivonaw.pdfIn PDF document text
- https://napraforgohotel.hu/upload/file/8002371246.pdfIn PDF document text
- http://thesprotia.gr/uploads/file/19957400811.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33506208e---88368061971.pdfIn PDF document text
- http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e72f62e7e---wipuzotev.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5a2ea2f39---kerekarew.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ab762489096---jixewapilokoliro.pdfIn PDF document text
- https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/l6p79h08l812j50642oess2pr1/2024243518.pdfIn PDF document text
- http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/guwokezunatizobuniwezuwu.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbafc2d8fc---wipexilo.pdfIn PDF document text
- https://bursac.net/userfiles/file/55044617750.pdfIn PDF document text
- https://gionggiacam.com/ckfinder/userfiles/files/ligotis.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a918bd4a9a3---basaralebuf.pdfIn PDF document text
- https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d704a618c763a06d1513418237bcc6f9/5391010387.pdfIn PDF document text
- http://2478.ru/admin/ckfinder/userfiles/files/42391924350.pdfIn PDF document text
- http://kpdb.org/userfiles/files/komewojujevenobipefubujuw.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8487da374cda0f974ad283b1d1b994a5/zutunukiditojovezabile.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c6cb233b7fedcffe46231d7ae0bdbb26/womilepaxezidulo.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_off0000c1a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1A2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d9b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9B9	10480 bytes
SHA-256: `b5868c492f587fd99af3bd785bbbcecd3c37514d451baeac3be245a01972cc21`
`font_02_sfnt_off0000f1a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1A3	16256 bytes
SHA-256: `9358e989fca53db93001aa43fa5a43be4daea4e9366e2854597275baac9bc744`

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