PDF malware analysis — malicious · 57166d22ee6615c3

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 20:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: ed77a78b0cdcbdc8c55634afc0327b01 SHA-1: 0ed7918a92fd19baaabfd80a846a898e924c6796 SHA-256: 57166d22ee6615c3c33f1a5ae1ae15c9e41d3a20f9d8320122688cc2e05000b0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.8798

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFNoValidXRef. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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 http://imcborivali.org/userfiles/file/22109195445.pdf In PDF document text
- http://cpgny.com/userfiles/files/sugagosipe.pdfIn PDF document text
- http://jyjjapan.jp/files/ckeditor/files/5320108970.pdfIn PDF document text
- http://studiozoppini.com/userfiles/files/85975134699.pdfIn PDF document text
- https://termoformat.md/img/files/kalisikesadesukefiv.pdfIn PDF document text
- http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161366499ca2f6---vifof.pdfIn PDF document text
- http://esen.life/userfiles/file/zegumukifedosowojawitiza.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee95163b9f---jegusexafonupawolezalek.pdfIn PDF document text
- https://777mto.info/contents/files/29133223413.pdfIn PDF document text
- http://floramarble.com/uploads/vedijijola.pdfIn PDF document text
- http://g-shocktou.com/user_file/file/wuzano.pdfIn PDF document text
- http://donghobaoan.com/uploads/files/surugogeludovevunivosukos.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131c51f12a2a---rutasabamosulinukiz.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134d5b88d77e---6577509286.pdfIn PDF document text
- https://shriramsteels.in/public/ckfinder/userfiles/files/35875610510.pdfIn PDF document text
- http://hcvitamin.com/webroot/img/files/16983151300.pdfIn PDF document text
- http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37404836696.pdfIn PDF document text
- http://fcv-bo.org/data/fcv-bo/userfiles/file/dilinofoxilumajozarorisop.pdfIn PDF document text
- https://ecoquimica.cl/dinamicos/uploads/file/5548929585.pdfIn PDF document text
- http://car-zone.sk/data/data/file/64500253539.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140614f428ed---xejonesudukizujogovasukel.pdfIn PDF document text
- http://weifong.tw/fckimages/file/26861877154.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=instagram+lagging+androidPDF 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_off0000c290.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC290	17416 bytes
SHA-256: `f88b673b838fc5838685a83032e9542030fe4003d3f4720b3cc9d2e756bc4809`
`font_01_sfnt_off0000f01a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF01A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010831.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10831	10412 bytes
SHA-256: `cfab0938d58879f633bddc3ee1438b2755997f2ae8fb8c69080786626ec542ce`

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