PDF malware analysis — malicious · c4b9002aa5baf380

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 01:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: ba5233ecd9fa392849d95fe3e68bb357 SHA-1: f80ea05fc48ba23eff46b3cf3f4750b834765c9f SHA-256: c4b9002aa5baf38077d179e38ac989d4a187923304bcb9c1c7b5890ff88df113

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing or malware distribution sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://hsiaoying.com/userfiles/file/91734859949.pdf In PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/badgctv0dgpp07551lm6qejdt7/57759923784.pdfIn PDF document text
- http://kavernoklub.com/campannas/file/86757962527.pdfIn PDF document text
- http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2767316890.pdfIn PDF document text
- http://supermarketdv.ru/files/file/8100011859.pdfIn PDF document text
- http://peaceinsrilanka.lk/userfiles/file/12858570138.pdfIn PDF document text
- https://gberwanda.com/gbe/useruploads/blogs/files/14651860651.pdfIn PDF document text
- http://kovacsoltvaskerites.hu/images/file/luraxav.pdfIn PDF document text
- https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/72pvn8figvs8e6588qtmbgb234/56821610910.pdfIn PDF document text
- http://thietbianninh188.com/uploads/files/gufolabosikagamonopuxum.pdfIn PDF document text
- https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/b843ebde995496b1d45cdfe53e4635cf/vemagudelabegimaru.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/nja3k036a2tpok5n9qj6dttl76/lulabumufelutajo.pdfIn PDF document text
- https://rowanmkt.com/Uploads/ckfinder/userfiles/files/94579576692.pdfIn PDF document text
- http://smeclassof1987reunion.com/clients/37165/File/11361132360.pdfIn PDF document text
- https://its-bulgaria.bg/files/file/98186974054.pdfIn PDF document text
- https://wrd13.com/force/file/zudetemugulukudapadukasez.pdfIn PDF document text
- https://foodphotoshop.com/userfiles/files/xodisejoxasujugaduta.pdfIn PDF document text
- https://worldcastlive.com/userfiles/file/30322862357.pdfIn PDF document text
- http://winecellarkeeper.com/ckfinder/userfiles/files/38966714301.pdfIn PDF document text
- https://bbpartner.cz/userfiles/file/rokarowulugipisikidepe.pdfIn PDF document text
- http://deeringbayrealestate.com/userfiles/files/xujino.pdfIn PDF document text
- https://ciar.vn/uploads/image/files/60787529214.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f42a337dcff941a5546ca1546588bcbd/78746963823.pdfIn PDF document text
- http://madmojo.com/fckupload/file/lozanebexosulowujuwoge.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=arnold+chiari+malformation+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_off0000d9b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9B0	10568 bytes
SHA-256: `03c69b0ca365241b22c4f9b0cbcfa499d9a84b57a355afea9abe708c99c79445`
`font_01_sfnt_off0000f185.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF185	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010997.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10997	17192 bytes
SHA-256: `d2ef0c6f9d0a36912b43a3978937f76616448d6db7e331487baf2ebcd007aa65`

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