PDF malware analysis — malicious · c76722beb2c88b51

MALICIOUS

PDF

88.0 KB Created: 2021-07-13 23:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 9a50663c7ca9dfc90c0dcee7d8a7cd68 SHA-1: b61e1d5579c1f6d0fac5758aa2f407a95996a8b8 SHA-256: c76722beb2c88b51962089ab99e58b5845e80ea97f044601d5b8bb0b1ee50c20

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is structured as a link farm to redirect users to potentially harmful content.

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://chcial.ru/uplcv?utm_term=which+jdk+to+download PDF link annotation
- http://soepcentrale-dekeyser.be/userfiles/file/purazigizazakibazipe.pdfIn PDF document text
- http://flooroverstock.com/admin/userfiles/file/voferatimarunupawemofep.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f1db8eef---bofitekimimigegin.pdfIn PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/baeaec85514d7d6d4def298bf79e8793/10203992067.pdfIn PDF document text
- http://euroteam.vn/ckfinder/userfiles//files/boduwu.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2d41bdac5277e568a8c8fd3cb097ae8b/migeruwiwixesofowit.pdfIn PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3a2b36cfbc59d47991c2cb3414bc6ed9/56631016609.pdfIn PDF document text
- https://an-professional.ru/img/files/file/63913948727.pdfIn PDF document text
- https://pet-fashion.ro/mm/file/38035222486.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160723fb2f1fed---59784616691.pdfIn PDF document text
- http://haohanlegend.com/Uploadfiles/files/90011198287.pdfIn PDF document text
- https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/k0v4fmbhd9vid56q83osh7dr43/zupujatev.pdfIn PDF document text
- https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/cd34eab740ce373a5b1b072e351182ed/sosufewasutu.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5607e16e55---57012660786.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d1fd42cf05b4ae559a0fc875882531f8/77878320054.pdfIn PDF document text
- https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/nlkbnr1m8giifo14qbta3bd799/83781494149.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/be443cd24e0f6ea8e53b03993c82f561/xetixijesarogorevakibubow.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ab134fb8344569b7b4302565eaa24a25/98178263444.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc59e06b4a---58633815201.pdfIn PDF document text
- http://vanharteyoga.nl/uploads/files/23426481620.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6ed60d1b---17425034339.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0c12a2c0---84744757759.pdfIn PDF document text
- https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a764ae5f59---75360267565.pdfIn PDF document text
- https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e40ee8ce5---pipibegijepuva.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_off0000f6f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6F0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010f07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F07	10368 bytes
SHA-256: `cc8869e52bd587f609b4df5ae2eeb39546ec91b843700dd23311d279e540c7f6`
`font_02_sfnt_off00012660.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12660	17160 bytes
SHA-256: `9a9e2034e439e5a4583dc828c90601a2c9d51fb93a42821b4e6a59c2eb1a13cd`

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