PDF malware analysis — malicious · f924d23c4196a348

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 13:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4b89794f80c152a592bf451156a86b75 SHA-1: c279ddd8594175d4339b904681bd8218739c21cd SHA-256: f924d23c4196a348e8dac4e4e2ef20f8d4e358847e20b35fc43a50d9a44ab75f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly indicates a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093addc79b4e---4309762149.pdf In PDF document text
- https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8f64389ec7f5f4a15188dd4443a90b77/74057455312.pdfIn PDF document text
- http://tw-go.org/files/gasebatugader.pdfIn PDF document text
- http://aeronautike.com/userfiles/file/81134845225.pdfIn PDF document text
- https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b7b466c73dc42864773f0660da0329db/17179601928.pdfIn PDF document text
- http://unipsyclinic.com/userfiles/file/20210623214443.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d5953bbb9c550f3a3574584d2275097/sajetizamexofowazozu.pdfIn PDF document text
- http://heizler.hu/files/file/lokizekafajulipewegugi.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6554feef10479813bf6afefa18495e58/zudowomitoreronarek.pdfIn PDF document text
- http://allaboutdowney.com/userimages/wukaropejodadu.pdfIn PDF document text
- http://akinmedikal.com/uploads/file/wogixisunixiga.pdfIn PDF document text
- https://cafe-malaysia.com/contents/file/63536172743.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/80567351858.pdfIn PDF document text
- http://ilksolar.com/Images/Media/files/kofujaxejebazixerulusilo.pdfIn PDF document text
- https://cmsschoolkg.org/userfiles/file/lukulonafegola.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891c66c0541---58004233686.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b240ca62e5---13309813771.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2495d27c---tosopegudobudabogemevi.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0441b9d8260ac41a8c8025039c127184/31059446441.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3bf34f3561f93726b197997c9deb03fc/zusarow.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962924eae0f---5764867081.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a144269b8---87935575505.pdfIn PDF document text
- https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/0c9bfc49495c0e4db624fa5021cc34e6/30666230204.pdfIn PDF document text
- https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983935b0d45---29460667462.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tu28ctllfmco6crimpn5th4i5t/pasupijef.pdfIn PDF document text
- http://gorisum.net/fckeditor/upload_file/file/7899064423.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=addison+wesley+science+10+textbook+pdfPDF 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_off0000f414.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF414	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010c2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C2B	11040 bytes
SHA-256: `19b0da83aaef9353ee5c9229bfdda411503f43ecccb91ae0d8846508ac1d818d`
`font_02_sfnt_off000125e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125E6	16024 bytes
SHA-256: `1adedc5196de49f4f074d0dcf978ba0f2e50dca4b694e74a852437f9c873b226`

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