PDF malware analysis — malicious · a43c6284fa47cfef

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 10:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 9c045ca35d5b86c565eba3f4b66139bc SHA-1: b635965be266f6b931a286c9ba843c3a24a88464 SHA-256: a43c6284fa47cfef65b695352599648b829db6e9c9402c3165103e748dffa772

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic indicate a social engineering tactic to trick users into clicking malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

Heuristics 7

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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607474cbd3078---85804984382.pdf In PDF document text
- http://inbond-cn.com/userfiles/file/wesetigurit.pdfIn PDF document text
- http://bclgrouptt.com/userfiles/file/bedipagorexubesaki.pdfIn PDF document text
- http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/kazomerirolewominigolajej.pdfIn PDF document text
- https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/qogl012gvt5jnsk4lq1gh8ssmv/jomememotuzujuguzero.pdfIn PDF document text
- https://hotelharmika.com/assets/userfiles/files/lazetetezitolusamo.pdfIn PDF document text
- http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/12596159600.pdfIn PDF document text
- http://blessingsngo.in/userfiles/files/50207869687.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/43d9a07628af816c88e695ad0c88db46/zunademi.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38571af8b7---70967035848.pdfIn PDF document text
- https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/8e65d4048d2b8cf385613244c5917495/27389461841.pdfIn PDF document text
- http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3701770998.pdfIn PDF document text
- https://skatrip.com/basefile/skatripcom/files/belaxojagatemana.pdfIn PDF document text
- http://wecans.net/_UploadFile/Images/file/pojisolixogawofojifum.pdfIn PDF document text
- http://joy05.com/_UploadFile/Images/file/33749048536.pdfIn PDF document text
- https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b255d473c40---devimozijefigip.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/05211b91f3f1fe3703ef9f8ede3cf2cc/xiwemuxamubavow.pdfIn PDF document text
- http://anjilh.com/uploadfile/file///2021043000581884.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bca0e08e3---tizevuk.pdfIn PDF document text
- http://mwflower.com/upimagesfile///4816203782.pdfIn PDF document text
- https://bitree.ru/ckfinder/userfiles/files/1314004474.pdfIn PDF document text
- http://www.verneteco.com/ckfinder/userfiles/files/86501586418.pdfIn PDF document text
- https://hanyauntuktesting.com/contents//files/16996950504.pdfIn PDF document text
- http://md-servicios.com/userfiles/file/letuvekeradolewisev.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=us+bank+access+online+test+answersPDF 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_off0000dacf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDACF	10548 bytes
SHA-256: `3a26a34a9942ab54b875187168edb7238a65bda510a77a0651a22a9cea1f4427`
`font_01_sfnt_off0000f30f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF30F	17152 bytes
SHA-256: `6156c7550e4cce83d12b5dcf22ad601750c95ce9251a4d01d83657712acac462`
`font_02_sfnt_off00011f8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F8F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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