PDF malware analysis — malicious · 9d113e04984fa3f9

MALICIOUS

PDF

73.6 KB Created: 2021-10-05 00:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: cdc71ad08b35161bd40bf4b6e214c609 SHA-1: 6bc663f1fb4882bd0622d243df191026c1281353 SHA-256: 9d113e04984fa3f99281822f466945dba352926bec479159557f71d6d3cc4bc3

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://equator-maritime.com/userfiles/file/sogelebakibi.pdf In PDF document text
- https://anyimaker.com/upload/users/files/51289365633.pdfIn PDF document text
- http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81584376437.pdfIn PDF document text
- http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87870911255.pdfIn PDF document text
- http://marikitaberbagi.com/userfiles/file/jolejawawujuretamusuk.pdfIn PDF document text
- http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ri1opcsnr7fq8okgvf3kcljdn6/97521310368.pdfIn PDF document text
- http://worldsocialistpartyindia.org/ckfinder/userfiles/files/70642180270.pdfIn PDF document text
- https://bonvoyageindia.in/ckfinder/userfiles/files/mekoxusuru.pdfIn PDF document text
- http://unsersohn.com/images/file/95692899486.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ffc94680250cf7e970fe0924f538e1e/21106050149.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5ffa2595274797337cc2a361572afc3a/2607025871.pdfIn PDF document text
- https://silverstonedevelopments.com/ckfinder/userfiles/files/wewowegumipufokabo.pdfIn PDF document text
- https://lordoptika.hu/files/files/56988867706.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16158a3dc00ada---3744836461.pdfIn PDF document text
- http://tenis-klubmoj.si/uporabnik/file/falalogozojov.pdfIn PDF document text
- http://stoewebdesign.no/userfiles/file/6373714804.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4b988a1a810279831984d263b929767a/pigoxipobixijinogevuzo.pdfIn PDF document text
- https://ctcitsupport.com/media/files/23570909952.pdfIn PDF document text
- https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/6eadf01ac07d97cf2879a5e571203a13/51542105638.pdfIn PDF document text
- http://edu-family72.ru/content/images/uploads/file/86271698848.pdfIn PDF document text
- http://park-seversk.ru/other/js/ckfinder/userfiles/files/48055457267.pdfIn PDF document text
- http://smeeing.com/userfiles/files/24124172147.pdfIn PDF document text
- http://anoh.net/pds/userfiles/files/83148855301.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=memory+reconsolidation+therapyPDF link annotation
- 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_off0000beda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEDA	15876 bytes
SHA-256: `f1e44b97487f6a65199339e4ad0520cb0b01bcc9369c8cac6c0a7b063f21f51e`
`font_01_sfnt_off0000e766.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE766	10888 bytes
SHA-256: `707d3f6029f4fa5864e8b96eea710831991d5eed9279c6bf94c923ba52affe91`
`font_02_sfnt_off00010068.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10068	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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