PDF malware analysis — malicious · f57287ab5fd27bdc

MALICIOUS

PDF

98.8 KB Created: 2021-07-16 16:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: a517267384769ad6f957ee70fb9c7e8c SHA-1: a93e52dd607619e6c68c7441c3ccccb1cb25abb9 SHA-256: f57287ab5fd27bdca7d65c6c6a40af65b33cb668f33a3b29265a9ad33eb1df24

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of these links suggests an intent to lure users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9800

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=old+adage+sayings PDF link annotation
- http://goteneplast.se/files/images/file/30101313536.pdfIn PDF document text
- https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/5l9e4urv2resdeaqm5mqo98ls3/limamowed.pdfIn PDF document text
- http://learningkey.org/userfiles/vopaze.pdfIn PDF document text
- http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955517ee8e0---77127275498.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/291ccb50d71f77b1372189357e3120bc/40495824522.pdfIn PDF document text
- http://gocreate.termall.pl/upload/fck/file/75260432867.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c370bacb653---kujoxezube.pdfIn PDF document text
- https://biothiennam.com/media/ftp/file/91535180049.pdfIn PDF document text
- http://perfekttorun.pl/pliki/17021241793.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7c931c78b55475929961957ce40649de/64341170347.pdfIn PDF document text
- https://study4student.com/cache/fck_files/file/1561420267.pdfIn PDF document text
- http://esthebel.de/userfiles/file/73893790675.pdfIn PDF document text
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dbaaaaadb382451e0af7046ebeede71/13122885539.pdfIn PDF document text
- http://adacu.org/userfiles/file/20210702103158.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fb86e32a6---pufikivowezugilofolaneki.pdfIn PDF document text
- http://isystem.hu/ckfinder/userfiles/files/saniwopak.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abaa8b3b34f---7252176912.pdfIn PDF document text
- http://alpha-th.com/userfiles/file/vefesoju.pdfIn PDF document text
- https://searchlink.org/userfiles//file/lezixobopijagoxa.pdfIn PDF document text
- http://bainihu.com/upfiles/editor/files/vusedorexosefopobu.pdfIn PDF document text
- http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ebc3371bdbe44b188f65c2e213a0e2df/92589698379.pdfIn PDF document text
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160960bae714eb---8370587101.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf80164032e---47684918550.pdfIn PDF document text
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bef75182078---22209424122.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be06c27b662---84583240412.pdfIn PDF document text
- https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/22n8bc1o637dq8o8hihftlkmqh/87413659838.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_off000120ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120AB	10244 bytes
SHA-256: `11749ad3c97c994b1d2ccf965b6a67cf6fd12d09408f6060a661e66b088c58ea`
`font_01_sfnt_off00013797.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13797	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014fa9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14FA9	17884 bytes
SHA-256: `44fda8dc526c0ad63757068b4e6e47502c1c671913af6ed9fdc0d1e2cdb3e071`

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