PDF malware analysis — malicious · c18330202d628885

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 15:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: a408366cf1f40f0ed981dd9ee0a53c71 SHA-1: da2a443198ca13d00e046cc8362c9bbde648d1a1 SHA-256: c18330202d628885ad77618d27c2049d96934409dff3ef4d8ded77a3b90bb3a0

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=nightmare+before+christmas+android+theme PDF link annotation
- http://liga-stf.ru/i/upload/files/veworufepimogu.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323aec39dc2---52159087632.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e0b6431d805af70566dad30f89b2340f/nukupoxijozam.pdfIn PDF document text
- https://yaslibakicisi.net/userfiles/file/piledejumixokuxaxerag.pdfIn PDF document text
- https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/623244f9b9327dd64ea6c2599b4464cd/gapotogeza.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fd108de4263db824005e1d127a6d5873/lexupaperakosiwidi.pdfIn PDF document text
- http://bodegaadrover.com/userfiles/imagenes/sagawakukukedewuwufeg.pdfIn PDF document text
- http://phayaotechno.com/UserFiles/File/mapubezefozuri.pdfIn PDF document text
- https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/numali.pdfIn PDF document text
- http://anabakorea.jp/userfiles/file/sujijizozejajuwexexij.pdfIn PDF document text
- https://agros.net/uploads/file/4878740442.pdfIn PDF document text
- https://zapret-rf.org/web/img/podborky/files/pojafumatoxojuzifaj.pdfIn PDF document text
- https://morethancars.eu/uploads/edytor/file/jotilivojafugosa.pdfIn PDF document text
- https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e959c574---58532089347.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d3d7cf7b735a7aaf8b988c435813460e/16138538876.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/373f9a747d8f4f572abe08b4e66d8f8f/baguvawapu.pdfIn PDF document text
- http://donghobaoan.com/uploads/files/47763459664.pdfIn PDF document text
- https://cnc-ar.ro/files/file/3803836419.pdfIn PDF document text
- http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/30195803682.pdfIn PDF document text
- https://laps.pl/userfiles/file/20461327274.pdfIn PDF document text
- http://bona-agra.pl/Upload/file/mojakevapaletavumerusezu.pdfIn PDF document text
- https://winpoasia.com/ckfinder/userfiles/files/8219509072.pdfIn PDF document text
- http://nwatchonline.org/userfiles/file/ganiguma.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_off0000cfb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFB6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e7cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7CD	10996 bytes
SHA-256: `0e171897707bc416b1f7fbfda4ad1aa766e27135253c3c1268ad2c957aafdf57`
`font_02_sfnt_off000100ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100EF	18600 bytes
SHA-256: `2fd95833a9ea9f977836464df34fca1f8cbdccac523bf46b6aa24d73b283c434`

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