PDF malware analysis — malicious · 63bceda3ad96d701

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 10:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: ce6f435cb56f500890a30be82b14d201 SHA-1: cec118f0e28ca9b57f1172c91d8831b3479092ce SHA-256: 63bceda3ad96d701d09ef2b08fa728284e0428a4ab9c6813588296f16eb69a6e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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 http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814148ab8ad---7251789202.pdf In PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f944441a5e---98876036184.pdfIn PDF document text
- https://eliteplacementagency.com/uploads/files/sazabuwagokav.pdfIn PDF document text
- https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/0m1hmf2i52l7kvssh4hos0bgoi/mapozipawagimawipufa.pdfIn PDF document text
- http://slenderclub.cz/ckfinder/userfiles/files/60234013098.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb061fa909e---98477748557.pdfIn PDF document text
- https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/nrimmppvpn3lc723os47ols12q/8929068279.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3a893d63c---dosavoweb.pdfIn PDF document text
- https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/at3hgmlmviolrrk5cikpbqfder/21067889388.pdfIn PDF document text
- http://terezszilvia.com/images/uploaded/file/59072600288.pdfIn PDF document text
- https://goldmenu.com/userfiles/file/53732466962.pdfIn PDF document text
- http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/mudatujutogex.pdfIn PDF document text
- https://tort-art.ru/userfiles/file/99236296995.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/fdae862257e51ea9016165ac69c4e9ce/delajaged.pdfIn PDF document text
- http://think6.net/ckfinder/userfiles/files/20210704084212.pdfIn PDF document text
- https://dianthusindustrial.com/resimler/files/teperekepogesuwaxoka.pdfIn PDF document text
- http://limeitec.com/upfiles/editor/files/fejivi.pdfIn PDF document text
- http://pension-erlkoenig.de/img/editor/file/jawegaf.pdfIn PDF document text
- http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/jafidarunavokaj.pdfIn PDF document text
- https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecdddefd77---somiju.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bade221e8587d65df5673e895d8f1dd6/visufebozisupapavufi.pdfIn PDF document text
- https://nhachoxebus.com/upload/fck/file/4360047381.pdfIn PDF document text
- https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9c0eced6---14218689315.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca39571617---41159046731.pdfIn PDF document text
- https://hizlipin.com/calisma2/files/uploads/11816368854.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f8923fa8cc07236db1c41612eb67726d/desowosuwawubaga.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=red+swelling+under+eyePDF 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_off0000ea9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA9D	16900 bytes
SHA-256: `85c306d185308ce55ef53dd66542b8cfe763fb5c9f56cba3ac122792f280ad1e`
`font_01_sfnt_off000115dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115DC	10388 bytes
SHA-256: `081ef362f68de6a92edbde25c1cad270cec5e1023802acd196fc470ffd5efafa`
`font_02_sfnt_off00012d4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D4B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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