PDF malware analysis — malicious · 93b2798537864655

MALICIOUS

PDF

72.5 KB Created: 2021-10-03 04:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: f4f22ae5456fccca3f947a2edb653706 SHA-1: 606a76ed509f7c4a59d5ecdaf1d33fe06b165dba SHA-256: 93b279853786465512317929bd667d19b109967faedbdc288ab74bbbc4823fcd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to multiple unknown URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, hence the T1059.007 technique is included.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://lncxjzxxw.com/upload_fck/file/2021-9-20/20210920090908585642.pdf In PDF document text
- https://optimumquestsolutions.com/ckfinder/userfiles/files/xuzexozavonabuvumalupoki.pdfIn PDF document text
- http://oiseau-bleu-morzine.com/userfiles/file/68538442262.pdfIn PDF document text
- https://dolphinsolutions.net/ckfinder/userfiles/files/dajazonixuzavuzomoz.pdfIn PDF document text
- http://babijie.com/upload_fck/file/2021-9-20/20210920035444677953.pdfIn PDF document text
- https://onlinendttraining.com/files/15514075533.pdfIn PDF document text
- http://chayka-svg.ru/files/zojatedomitamusewin.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b3cc04c34539bb3f961bad5a2ba1dcb8/wukibel.pdfIn PDF document text
- https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/20984963433.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141d262000e0---pepinoraditisa.pdfIn PDF document text
- http://baovephuongtroi.com/vietkiendo/upload/file/siradidaviva.pdfIn PDF document text
- http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140176b4f349---16738612454.pdfIn PDF document text
- http://ggbris.com/slbdavbatala/userfiles/file/pasixojobik.pdfIn PDF document text
- http://prospekt-rostov.ru/ckfinder/userfiles/files/tamokusodubu.pdfIn PDF document text
- http://tksvolga.ru/userfiles/file/56577684304.pdfIn PDF document text
- http://hk-sai.com/ckfinder/userfiles/files/74637996019.pdfIn PDF document text
- http://mapect.com/upload/fckeditor/file/86572301386.pdfIn PDF document text
- https://seerupit.dk/assens/file/kaniloluvunodowusamur.pdfIn PDF document text
- http://lnyuanzong.com/uploads/files/20210905195336.pdfIn PDF document text
- https://elitstroycraft.ru/source/file/joguzukakezetemofulitof.pdfIn PDF document text
- http://nationshield.ae/userfiles/files/wegonezerivisu.pdfIn PDF document text
- https://rlmahtani.com/userfiles/files/sofipuzozosapeb.pdfIn PDF document text
- https://www.prieur-equipement.com/ckfinder/userfiles/files/23804127122.pdfIn PDF document text
- http://sungwoneng.com/upfile_editor/2021/files/lijibos.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=elements+in+group+7PDF 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_off0000b697.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB697	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cea9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEA9	17984 bytes
SHA-256: `8333030eff33dffe89ee9b33b3231ac095bf32f61cb1ce2393ea8a9a43e60ab8`
`font_02_sfnt_off0000fc3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC3F	10568 bytes
SHA-256: `bc78d198807d96b831f3d835f6bd4e0ca932074594d988f7e2c38b22604170a7`

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