PDF malware analysis — malicious · baab5121ad217587

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 03:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 6d02851a3129b87e3ec173a0c56890e5 SHA-1: 38843928629e3d63c824fa9d7add8065fdec3aa1 SHA-256: baab5121ad21758746cf2801790fd57b241832ba0ed35adf0e12ba6fc32b45db

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, often associated with SEO poisoning or phishing campaigns. While no scripts were explicitly extracted, the nature of the URLs and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings suggest the document is designed to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://philabc.ru/uplcv?utm_term=hide+sensitive+notification+content+meaning PDF link annotation
- https://rubfila.in/files/file/lulojefuxaxe.pdfIn PDF document text
- http://www.og2c.com/images/file/35163913796.pdfIn PDF document text
- http://studiotecnicobergamaschi.it/userfiles/files/tizogomadamaxobixo.pdfIn PDF document text
- https://0922.sproname.com/files/userfiles/files/80177486686.pdfIn PDF document text
- http://smartwealthhk.com/userfiles/6696453554.pdfIn PDF document text
- https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/656806d3c0e29934860ed0a43080c24c/satepebepurijumupu.pdfIn PDF document text
- http://bsinteriordesigner.com/userfiles/files/kowanovugob.pdfIn PDF document text
- https://red-adlay.com/upload/files/6448020376.pdfIn PDF document text
- http://qlionshousing.ca/userfiles/file/55997674414.pdfIn PDF document text
- http://manilag.com/FileData/ckfinder/files/20210905_9F2A7DEE4C1850F8.pdfIn PDF document text
- https://lesura.net/userfiles/file/54332439071.pdfIn PDF document text
- http://donauwell.at/userfiles/file/bepubavipapijoxijonutori.pdfIn PDF document text
- http://fcvperu.org/data/fcvperu/userfiles/file/rujomusukemakijedege.pdfIn PDF document text
- https://conexkarvan.com/cache/fck_files/file/44321851964.pdfIn PDF document text
- http://ducnhua.com/upload/files/31768693326.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/5987595288d4bba37c55246c73cfb386/87737956058.pdfIn PDF document text
- http://autobedrijvenindex.nl/images/uploads/30960172220.pdfIn PDF document text
- https://study-abroad-travel.com/ckfinder/userfiles/file/82997261900.pdfIn PDF document text
- https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/refuniliz.pdfIn PDF document text
- http://autoscuolepintozzi.it/userfiles/files/62748658802.pdfIn PDF document text
- http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/memenomisasazijase.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161382a0e15cf1---nukokozemunazebinus.pdfIn PDF document text
- http://dsagco.com/Upload/file/46557034944.pdfIn PDF document text
- https://egyediajandekotletek.hu/mvc/userfiles/file/50824622539.pdfIn PDF document text
- http://reklama-kemerovo.ru/files/files/44576302372.pdfIn PDF document text
- http://piotrkowska77.pl/zdjeciafile/88679114240.pdfIn PDF document text
- https://shop-ecobati.com/medias/upload/files/9108493659.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_off0000d8d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8D2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f0e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0E9	10732 bytes
SHA-256: `299872a4fe046b7375d040e985939188a51f70db1c21ef238e5f88593fe8e0e1`
`font_02_sfnt_off00010959.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10959	16520 bytes
SHA-256: `0648522faffe9f7cc1280b421b9d89c6433f362a4483177fd2977309da7bb1b8`

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