PDF malware analysis — malicious · 1d9b565069874762

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 02:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 63daee54d9b26a9d3fede948b40a7dd2 SHA-1: c61204bb04d09c2e6b2fdabf7002af7bfe0e89dc SHA-256: 1d9b5650698747621c5df6e71bc7bb0ca38c0630e1fb12e4b5747e651b91b34d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

Nyx PDF Classifier malicious score 0.9169

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. 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 https://medvor.ru/uplcv?utm_term=longitude+latitude+worksheet+3rd+grade PDF link annotation
- http://ccsup.co.th/uploads/ckfinder/files/71688677568.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/se3rrbvo430uhgo998lfbpr5m1/kaxerera.pdfIn PDF document text
- http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ea5a58cb2---47729856332.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fi04042vld6oi09g4gsgasl2j1/62505082505.pdfIn PDF document text
- http://beiwendq.com/userfiles/file/28751280698.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b7ac559ca8d6c25e605b57a4bc62be6f/xamewebelitagazarenu.pdfIn PDF document text
- http://shipsupply.ru/userfiles/files/mitopibewebin.pdfIn PDF document text
- https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/0janidfmd11e2lgsaa6p22pdd4/16608847950.pdfIn PDF document text
- https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/9a4bdb7fc03cbe667669a686b0191651/37305566454.pdfIn PDF document text
- http://sumtinathholidays.com/admin/uploadfiles/file/48049929512.pdfIn PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160debf071ead3---34956897513.pdfIn PDF document text
- https://rainbowprinter.com/app/webroot/files/file/lebobinok.pdfIn PDF document text
- https://mimpishiosatu.com/contents//files/6230237337.pdfIn PDF document text
- http://clarksville.net/wysiwygfiles/file/pader.pdfIn PDF document text
- http://photonart.nl/phpcmsys/file/18778225177.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/kotivebobibixeziwubudi.pdfIn PDF document text
- https://veterinarycarefoundation.org/userfiles/file/69325869075.pdfIn PDF document text
- http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/kokopilasukarupe.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612948b8d78f6---fabunemisojeju.pdfIn PDF document text
- https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/logudinurik.pdfIn PDF document text
- http://shqinze.net/admin/upimg/file///sunavi.pdfIn 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_off0000dc80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC80	19584 bytes
SHA-256: `89fb991e50062be026498baae875f90781cabf0583d67c141d994dd0957da5bb`
`font_01_sfnt_off00010e02.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E02	10932 bytes
SHA-256: `a5cbd1df51769b3e8fc748600c1a4a1b2239cc12c88d31b0d76063e2da9b0e59`
`font_02_sfnt_off0001273a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1273A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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