PDF malware analysis — malicious · 15c98367e5a641cb

MALICIOUS

PDF

71.2 KB Created: 2021-09-13 04:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 3b3ba25d5784fc9cc93e1c93285b2fce SHA-1: 154294dcebd6935ad787b09d11e141f4261d7279 SHA-256: 15c98367e5a641cbe54da8ac91bcb45e55c374959d339ec95ee701a7f5f01468

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting a phishing or redirection scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing towards the distribution of malicious content or phishing lures.

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://pixomot.ru/uplcv?utm_term=number+search+puzzle+pdf PDF link annotation
- http://mayjack.com/upload/files/40547009145.pdfIn PDF document text
- https://247christianity.org/fckeditor/userfiles/file/772455650161631494039.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/zemekidonikibagodewawin.pdfIn PDF document text
- https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/24547126486.pdfIn PDF document text
- http://n-production.com/upload/fckeditor/file/kowoverexebomog.pdfIn PDF document text
- https://jerseyshorepirates.com/userfiles/files/75823212698.pdfIn PDF document text
- http://land89.com/ckupload/files/dipanunaluzekovuzigew.pdfIn PDF document text
- http://ckm-machinery.com/userfiles/files/xoril.pdfIn PDF document text
- http://matstravel.ru/userfiles/file/burupegiziso.pdfIn PDF document text
- https://glbtrader.com/userfiles/file/49966305653.pdfIn PDF document text
- http://yavuzselimvakfi.org/resimler/site/files/rujetef.pdfIn PDF document text
- http://4reality.cz/userfiles/files/67971530452.pdfIn PDF document text
- http://newcityhk.com/userfiles/dixapuxamose.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b1a1ef5fc---didumupojifetanopukuk.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/i3dvanub9an3qu3fs84flh4pv0/49502971130.pdfIn PDF document text
- http://ewhamd.net/upFiles/ckeditor/files/gugetubobupusakozidulera.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6d4288b3366cd48c280be3eb134a90ea/50231956283.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/467a0c1236171f9e9811e2dc818125e0/86332407678.pdfIn PDF document text
- https://tlkingatlan.hu/kepek/other/file/82828849844.pdfIn PDF document text
- http://ideatity.com/ckfinder/userfiles/files/39675878861.pdfIn PDF document text
- http://na-bytecek.cz/UserFiles/File/25145209412.pdfIn PDF document text
- https://campermagazine.tv/public/file/98128532100.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/256bpqd10vgekkgi4stpfibu32/denijele.pdfIn PDF document text
- https://mayxaydungthienlong.com/uploads/files/files/pibasi.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_off0000b418.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB418	16664 bytes
SHA-256: `1f3cb6d902798ed57b5e11e5de4cc219ba92173f88602f2083a976dcaf3e9173`
`font_01_sfnt_off0000df05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF05	10748 bytes
SHA-256: `b097af2ef827a04881ae700c5b6da8d0a6db2dd12a51a076b9df4c05d744b9a8`
`font_02_sfnt_off0000f787.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF787	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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