PDF malware analysis — malicious · d3f734ec45458f26

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 11:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 376e8e59b3d286931d6f1d4e8d53f088 SHA-1: 0c000da30d198cabb3b9309c063d5fdeff284698 SHA-256: d3f734ec45458f26589975b768813bf304c1ece1981559f3af1ac76938d6d5e4

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these various domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9925

Heuristics 5

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
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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f322f1159e1b5db1617a7649aff2e3fd/39400402546.pdf In PDF document text
- https://paklya.su/design/img/upload/file/68843768438.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ccv8sfh8lij0ommkt5jqkirdji/6197727525.pdfIn PDF document text
- http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c8af6dcc87fb2ea93681d85a17cfe1e2/pabuvagovorixubuw.pdfIn PDF document text
- https://leise.ru/admin/ckfinder/userfiles/files/32567759798.pdfIn PDF document text
- https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/67iiitin36rq9623pph3q9smj8/potujoninor.pdfIn PDF document text
- https://prokoncept.hu/admin/blogfck/image/file/9420643605.pdfIn PDF document text
- https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/1f05cd41d5d8faaece43ce05b51e2244/jateberamix.pdfIn PDF document text
- http://spiregene.com/image/files/20210718_072717.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120db9328023---novunoru.pdfIn PDF document text
- http://allasclub.com/campannas/file/pudixipugu.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8d877badd334c17ea6ea0606d3f8a136/25977495838.pdfIn PDF document text
- https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/c949647f8f14057bb3fd6706655b8452/52667686260.pdfIn PDF document text
- http://daearesort.com/FileData/ckfinder/files/20210731_C15869EB8D34CC66.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a21e9c1d81e0fb63d34f1e1117affe68/dudavamepuwevad.pdfIn PDF document text
- http://namthangbasaltstone.com/uploads/image/files/bixufex.pdfIn PDF document text
- http://eraldocomo.it/userfiles/files/sojuguwekijewomiveka.pdfIn PDF document text
- https://hometeamcorp.com/images/usr/47860879962.pdfIn PDF document text
- https://szabobuszrendeles.hu/files/files/lofaziporutugan.pdfIn PDF document text
- http://tivatijapan.com/uploads/userfiles/file/3461286640.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2815a82bf---7309769807.pdfIn PDF document text
- https://z87992961.com/upload/files/20210728123704.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=japanese+alphabet+and+numbersPDF link annotation
- 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_off0000d802.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD802	21552 bytes
SHA-256: `4ade4bc98018317b6e856e1f8155de354563e587316180a403744548544b6f25`
`font_01_sfnt_off000110b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110B7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000128ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128CE	10676 bytes
SHA-256: `f5b07f806fe82c8df50171eb8d99895a6d16eb049b54e7bde8296391c39e274e`

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