PDF malware analysis — malicious · 82aea4ee23d2c22f

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 08:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 4c80a30f7cb3df7e367970cb0fdff4af SHA-1: 291c5d564fc7998090f44f88823669a2f49e9541 SHA-256: 82aea4ee23d2c22f86d71c56d4b85d0450cb84a63bcd0338569e038ac37899a6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 6

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.
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://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1c0e71ff---batolejazixafedidoxixe.pdf In PDF document text
- https://guclupin.com/calisma2/files/uploads/xifap.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097989652aee---xozerifuzosovofuveguxeb.pdfIn PDF document text
- http://pereplanirovkaoblast.ru/pict/file/53993147283.pdfIn PDF document text
- https://verandapattaya.com/userfiles/files/musizibarijozezu.pdfIn PDF document text
- http://groupkaishan.com/d/files/dizoj.pdfIn PDF document text
- http://medicare-darmstadt.de/bilder/UserImages/file/dakefuxagulajapotuzug.pdfIn PDF document text
- http://streetnn.ru/data/upload/ck/files/44424906829.pdfIn PDF document text
- http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/eca7784d5dc75d0fab9c4b6cbe5a38b2/63477650708.pdfIn PDF document text
- http://nfc.soo.jp/file/82146304880.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/976fd60dbe63bab9636303761d0091df/bokabudumekasowuno.pdfIn PDF document text
- http://unseenadventure.com/userfiles/file/pepepumemowasekiwopu.pdfIn PDF document text
- https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/609d62916626c0e4e3e6412445e82578/18765186819.pdfIn PDF document text
- https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/10c107afa8020b17f417c1c8e9db6a1a/73855344356.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/h2906pp6k820pi7mpgsh50rt3j/lutejigemosar.pdfIn PDF document text
- http://dambi.pl/userfiles/file/zujebejofilagakunozul.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f81e43c2---56821620292.pdfIn PDF document text
- http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69254443372.pdfIn PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b315459652a---35543479939.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091f116ab92b---29991440322.pdfIn PDF document text
- http://redemaisfarma.com/userfiles/file/vudadexoletaruru.pdfIn PDF document text
- http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/5uusqqu37bh61ti7c00epitdva/24514720207.pdfIn PDF document text
- http://sbairs.com/datas/files/fiwigexinomomagawon.pdfIn PDF document text
- https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/0fc744625fed7a55153800bb98d473fc/8620319326.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7bae0131b---gukidul.pdfIn PDF document text
- https://ptogel2.com/contents//files/xepixeliredumujaz.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=saraswati+physical+education+book+for+class+11+pdf+downloadPDF 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_off0000d9d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9D5	11376 bytes
SHA-256: `564502940721638fd00432d17f7214947b92b9062629f586ee7aac3e169ea13c`
`font_01_sfnt_off0000f471.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF471	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010c83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C83	17932 bytes
SHA-256: `444dade16d9a113e645e57cd0f773d19ab853274730c43dda600bafa54232a35`

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