PDF malware analysis — malicious · b8e3c2565cbee145

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 18:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: b4b36db3e2b8f8dd34f203365e8610c8 SHA-1: 7d4e02d5d68248c0cfde6874b22ebcd7c0ccb81c SHA-256: b8e3c2565cbee14536e2240018a607ae9ca7a38db4a1e41897fc717d82fddab5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

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, suggesting an attempt to host malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs, many hosted on disposable domains or compromised sites, indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418496ca9b6---votegefego.pdf In PDF document text
- http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73349699245.pdfIn PDF document text
- http://itineraire-consulting.com/ckfinder/userfiles/files/75259472912.pdfIn PDF document text
- https://laurallo.com/ckfinder/userfiles/files/33694783670.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143144e4717c---vugef.pdfIn PDF document text
- https://soudurelausiere.ca/upload/editor/file/47222029480.pdfIn PDF document text
- http://dailymaydemtien.com/userfiles/files/bimexevexepi.pdfIn PDF document text
- https://holocaustresearch.pl/nowy/photo/file/varinavugobevoxujo.pdfIn PDF document text
- http://pcccphucvinh.com/upload/files/97022505564.pdfIn PDF document text
- http://drxzhang.com/userfiles/file/penakaluwijizudova.pdfIn PDF document text
- https://vcvscr.cz/www/www/fckphotos/file/35674435576.pdfIn PDF document text
- https://greenfuturevietnam.com/Upload/files/belusedu.pdfIn PDF document text
- https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/32b1773f0f18e39e60cca4d2589581b8/42902176729.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f84679b06---jafemujepig.pdfIn PDF document text
- https://tefen67.com/userfiles/files/jibesasonalud.pdfIn PDF document text
- http://aktasmatbaacilik.com/resimlerfiles/76975281862.pdfIn PDF document text
- http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/menapurabibututatedoli.pdfIn PDF document text
- https://dawnraytech.985.tw/data/file/userfiles/files/33403091894.pdfIn PDF document text
- http://okeefesreef.com/ckfinder/userfiles/files/45861761824.pdfIn PDF document text
- http://lynxitservices.com/ckfinder/userfiles/files/4140285268.pdfIn PDF document text
- https://akrmedia.no/ckfinder/userfiles/files/gokajogutiduzawar.pdfIn PDF document text
- http://lindendirect.com/ckfinder/userfiles/files/60021904415.pdfIn PDF document text
- http://sarljarry.fr/userfiles/file/xajerodixu.pdfIn PDF document text
- http://streetnn.ru/data/upload/ck/files/derowo.pdfIn PDF document text
- http://wedding-box100.com/uploads/files/202109020437558617.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=reduce+touch+latency+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_off0000d4b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4B0	10560 bytes
SHA-256: `4a9cfc09949195c11586a9134a3247dd915a870784fd6b40276e00767be29f8f`
`font_01_sfnt_off0000ecb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECB3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000104c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104C5	17556 bytes
SHA-256: `d280c1a6570773a9c1de0a7d0461ebcb2fc5906c8de58a231367d1006a51dc08`

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