PDF malware analysis — malicious · cad6b34186db59b3

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 19:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01

MD5: 12a75e3658b89da08fa24fe15065a905 SHA-1: 517b93c897dfbdafe4db68e0a54c12c45275bd53 SHA-256: cad6b34186db59b3d97fc0e0d0b21e171a633dcaf9ee038cce9e10d1cd621776

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://laborke.ru/uplcv?utm_term=trusts+act+1973 PDF link annotation
- http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b18b584b3d7821cfe192f8888c1956c9/1128784728.pdfIn PDF document text
- http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b7baeb72---pubedazis.pdfIn PDF document text
- http://ydchem.cn/filespath/files/20210821222225.pdfIn PDF document text
- https://searchlink.org/userfiles//file/64027071917.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf547d13a71---gozedojonebi.pdfIn PDF document text
- http://tipsclubcr.com/campannas/file/58445126625.pdfIn PDF document text
- http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/nugakanubolekaku.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6d2b1d1f0---nafixobozibogedukomezi.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/luxilawasiruxokaxubop.pdfIn PDF document text
- http://ersatzmonitor.de/userfiles/file/50170424613.pdfIn PDF document text
- https://dacinsara.ro/fckfiles/file/64834483970.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/6lknnu6vi8feetj8a25o6ipcm4/kadafogebexedonokad.pdfIn PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b46728e49f8---51359225962.pdfIn PDF document text
- http://darienhigh70.com/clients/878490/File/siverepuxinunuj.pdfIn PDF document text
- http://architects-desk.com/uploadsfile/81087142767.pdfIn PDF document text
- https://luxm.pl/userfiles/file/gebamuguvulumudaxixe.pdfIn PDF document text
- http://merrygoldholidays.com/ckfinder/userfiles/files/3254875168.pdfIn PDF document text
- http://giprozdraw.ru/ckfinder/userfiles/files/sofiviwigigatebukizumep.pdfIn PDF document text
- http://fiumevivo.it/userfiles/files/kiramufale.pdfIn PDF document text
- https://suavitinhtannha.net/upload/files/magolovonetokosufetixi.pdfIn PDF document text
- https://toananhmedical.com/uploads/files/tosavonexavedipugikano.pdfIn PDF document text
- http://madmojo.com/fckupload/file/setapaxatuzagevotujozogu.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7c4dccec---869079299.pdfIn PDF document text
- https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/99b53998af5d99ca871eb3e0ee1fab01/fumutiv.pdfIn PDF document text
- http://luxe-pools.fr/i/File/zowuzarefejabubevuja.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a426a63a664---64583009200.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_off0000ed30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED30	10232 bytes
SHA-256: `1ea3c29561e0267c77bafae0ace2dd6b38811bfe12e7071530ce86936c077fe7`
`font_01_sfnt_off00010476.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10476	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011c88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C88	18152 bytes
SHA-256: `85d7f3297748f4a56c2ae802095e5a7b7336272e46c677ccd1973e398e5fcfe5`

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