PDF malware analysis — malicious · 82b2c2d5438c1975

MALICIOUS

PDF

88.7 KB Created: 2021-09-03 22:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 1aab95a124ae8a5ce739f497ebd72ccf SHA-1: f1f9551de95b64dd05186b27ca3a4611f0d5aa75 SHA-256: 82b2c2d5438c1975bc5be0e9322ca6f657d801f91c09df0a509ac1f8fb96d8e7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for exploitation or redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=soak+pit+design+pdf PDF link annotation
- http://www.halpellet.hu/userfiles/files/96501186474.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/55d04e721c0969b9b8c6270177023a9a/36822360254.pdfIn PDF document text
- http://geoodwierty.pl/files/file/gufepipebi.pdfIn PDF document text
- http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c72f012ea---35408048030.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1o1b30bo3k1n73b5g6a02q287j/suruxebo.pdfIn PDF document text
- https://castel.ro/userfiles/file/derafofadiwaxipider.pdfIn PDF document text
- https://congchung7.vn/upload/file/podaxusazeginonijelapo.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/18d0adfbfcd2bd75e301e703354bb057/ketapiwuduzazopafiz.pdfIn PDF document text
- https://fablab808.com/nbloom/fckuploads/file/20853063603.pdfIn PDF document text
- https://stdtekstil.com/upload/ckfinder/files/28034043011.pdfIn PDF document text
- http://xboxheerlen.nl/userfiles/file/zaxipinuwemofo.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f307710487f5bda7c270ee55fd492d6a/kitejimoli.pdfIn PDF document text
- http://stolizstekla.ru/userfiles/file/tepuzano.pdfIn PDF document text
- http://aimic.com/userfiles/file/61408399483.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32dc690c0---remunibeke.pdfIn PDF document text
- https://glycocalyx.nl/userfiles/image/file/15001589340.pdfIn PDF document text
- http://sugarfree-gelato.com/upload/file/62710558234.pdfIn PDF document text
- http://fine-cottage.ru/userfiles/files/xegajideterogajafepa.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/jizigug.pdfIn PDF document text
- https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/1m4d8il5t7dahje96l9cot5plh/30814591571.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00154437d---taxofaxawujoseniwuzokurij.pdfIn PDF document text
- http://soosanfix.com/upload/fckeditor/file/39237687376.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f42890018a9987b20f6738297cc32b6a/gupovowipilox.pdfIn PDF document text
- http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/31357199185.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_off0000f383.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF383	18960 bytes
SHA-256: `0ff88a1e1af9cc31f0797b31166466776e0c7b3aeb9076839c02973c473e67ca`
`font_01_sfnt_off000124c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124C8	10692 bytes
SHA-256: `55157c1d5439ffc3826cba98e3bc5477cbf2dfc745095f7b549a8c3a343fd7ed`
`font_02_sfnt_off00013d42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D42	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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