PDF malware analysis — malicious · 1a0c6b8a5c097d57

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 20:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: bb61cc7bcb6d6883e5520a398376e0c7 SHA-1: 115061abbeebcc91892e9f125c7ed512e99ceb90 SHA-256: 1a0c6b8a5c097d574231f41703dc89b1e2c9c202bb5702cc5e42695314728ceb

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many hosted on potentially compromised or disposable domains. The PDF structure and embedded links suggest an attempt to distribute malicious content or conduct phishing operations by leveraging SEO tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.5739

Heuristics 5

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
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://drcleancenter.com/uploads/files/202108180136211596.pdf In PDF document text
- https://thinkhigh-tech.com/d/files/15497945266.pdfIn PDF document text
- https://ytdrive.com/CKEdit/upload/files/podun.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db36ea81dd---36222277804.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/61f4f085bd757cf0191760af2a9da550/wusibemijuvusigipuso.pdfIn PDF document text
- http://frappsreagent.com/upload/files/57303703210.pdfIn PDF document text
- http://korealabels.com/ckfinder/userfiles/files/69201953829.pdfIn PDF document text
- https://maintogelonline2.com/contents/files/seboxo.pdfIn PDF document text
- http://akcompany.vn/uploads/userfiles/file/kigegidatakakufa.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a132feaa9f3---wewosi.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e60163986---gedabekuxunamoxubiw.pdfIn PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/637b8e73de0e2ef119948778767819f9/tinopelulodeluka.pdfIn PDF document text
- https://fceresources.com/ckfinder/userfiles/files/pusojazakubovejume.pdfIn PDF document text
- https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1bbad7653ca37b8ece357e3b152ccaad/busime.pdfIn PDF document text
- https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d9655c6ef7a9be2b0fe8da458318b7f9/wosirog.pdfIn PDF document text
- http://budaikepkeret.hu/uploads/file/kudax.pdfIn PDF document text
- http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/tils6ksa3pk8qqh0ecjcfak7b2/76961465239.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f1e33bcc1---bigolar.pdfIn PDF document text
- https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6e85udskf8ie65ig8dbfdgoe51/pefewuvomaliriralexadosi.pdfIn PDF document text
- https://sonntag-immobilien.lu/userfiles/files/burufasavebexomagesekofo.pdfIn PDF document text
- http://3dsami.org/uploadfilefiles/xomijuxilomojimi.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=greenlee+hand+bender+pdfPDF link annotation
- 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_off0000ca4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA4E	18064 bytes
SHA-256: `8f5405eb0ff814164da481336936f69edca83945b63fe6622157f12f7b5e4691`
`font_01_sfnt_off0000f999.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF999	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000111b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111B0	10296 bytes
SHA-256: `a951b2b6aa79688cb7daa1b50aed2872a48d4d062258a06e9da85d32acc0f8a8`

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