PDF malware analysis — malicious · 66d7eb58006cb9fc

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 03:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 1070a49023a2146a4176344ae01d8f8d SHA-1: 736985efa164b5e18cb120f0dfe6e6317b83df96 SHA-256: 66d7eb58006cb9fcdc5aee8bfd6af02ff962158bcc2b2bf6b2f5aa962f66bbab

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic further support the attack pattern of luring users to download content. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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 http://ateliergermain.net/sites/default/files/file/botofojapeson.pdf In PDF document text
- http://b40555.handyfriendship.com/upload/files/natotofesijesa.pdfIn PDF document text
- http://importfoodfair.com/userfiles/image/2021/09/file/pomaki.pdfIn PDF document text
- http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1015902809.pdfIn PDF document text
- http://autoscuolavalerio.it/userfiles/files/dojopufexixidu.pdfIn PDF document text
- https://araprinter.com/ckfinder/userfiles/files/gubuzuradiga.pdfIn PDF document text
- http://chandravanshi.com/userfiles/file/77920556316.pdfIn PDF document text
- http://gerastar.com/userfiles/file/gakekaripetovi.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/137f27938534865a313ccce24472c7ed/23201445302.pdfIn PDF document text
- http://dietaltop.com/userfiles/files/31585933635.pdfIn PDF document text
- http://alhouti.com/userfiles/file/9286594583.pdfIn PDF document text
- https://misbahelmudii.org/ckfinder/userfiles/files/1554850730.pdfIn PDF document text
- http://reklama-kemerovo.ru/files/files/tupesetomoworanulun.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/595d36e356763485e1bbcf050b8eb7ef/35600498552.pdfIn PDF document text
- http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lawuxafali.pdfIn PDF document text
- https://lesura.net/userfiles/file/5821626688.pdfIn PDF document text
- https://littleedupark.com/ckfinder/userfiles/files/76185123237.pdfIn PDF document text
- https://techlan.pl/files/file/36579027431.pdfIn PDF document text
- http://sissonne.hu/editor_up/kilidup.pdfIn PDF document text
- https://ariaparvaz.com/basefile/ariaparvazcom/files/67734812407.pdfIn PDF document text
- http://sinsg.com/files/fckeditor/file/42923093299.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa49b0bef---jizeradefozaziguvorafupe.pdfIn PDF document text
- http://gugugroup.com/userfiles/foleximojopokig.pdfIn PDF document text
- https://theatresaucinema.fr/uploads/file/danid.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+cannot+be+displayed+androidPDF 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_off0000dd1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD1B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f532.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF532	10868 bytes
SHA-256: `6834d2171166aa8337d9867d2b78bb17c68c21995d6985e90d857f554653dc09`
`font_02_sfnt_off00010e3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E3C	18416 bytes
SHA-256: `b2f4b26a9bfe0a7f9a261f512919febea306c354b1fa4ad8d3cb9871d0b05579`

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