PDF malware analysis — malicious · cbe9a2364e5c8224

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 07:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 6456941bde040fb3c32a7eebb7faa51c SHA-1: 0cf4e49081a81323a0f0d3a88f97c12ca86f433e SHA-256: cbe9a2364e5c8224678ffef6c38b41f0db1614d6d82185509a9b9627de9acca0

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure malicious destinations. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request to trick users into clicking the links. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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 http://capitaloffice.pl/fotki/file/24582132781.pdf In PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fb82e778f---koxesuko.pdfIn PDF document text
- http://asztromiskolc.hu/ckfinder/userfiles/files/ropivavevelari.pdfIn PDF document text
- https://pezenasenchantee.fr/userfiles/file/fuxugewutelazaj.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qaofumfacj37th24tb0ndl4dj7/90745903157.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ff4f4f457---xafazuborinazikinakor.pdfIn PDF document text
- http://exms.fr/sites/default/files/file/4996605791.pdfIn PDF document text
- http://bjavc.com/filespath/files/20210826104637.pdfIn PDF document text
- http://www.velkoobchod-man.eu/ckfinder/userfiles/files/wujavubanotuzusujo.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/53c6b94992bd7cf0d91d23c528dc4d76/92983285118.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/54217351466.pdfIn PDF document text
- http://rockhouseschool.com/rockhouse/uploads/files/befezuviwetuvole.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091376b63b81---39878031180.pdfIn PDF document text
- https://burstallconrad.com/editor_files/file/figitupibowasanotamidabij.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d874386f3---zagebekeviwazi.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/00037f2c9959bdc23dfa3da624abc574/daxem.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bfe82b84784e18035edb66b6965c52e4/63801334635.pdfIn PDF document text
- https://ppuhperspektywa.pl/files/edytor/file/63228320368.pdfIn PDF document text
- http://bukhatirhomes.com/userfiles/file/figafikote.pdfIn PDF document text
- http://herbwaterthailand.com/userfiles/files/lunag.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098542c57280---98678974026.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de7da3417e3---zepizexibapefowutaz.pdfIn PDF document text
- http://aranykoronakft.hu/userfiles/file/taselepujuwafuravisinolab.pdfIn PDF document text
- https://musikkursus.dk/userfiles/file/bawuxudolujomezeni.pdfIn PDF document text
- https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef33e616cd---zasokil.pdfIn PDF document text
- https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609efddee2ba4---4538419732.pdfIn PDF document text
- http://kiemdinhcan.com/Images_upload/files/5032720951.pdfIn PDF document text
- http://britishcytology.org.uk/ckfinder/userfiles/files/34082971838.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=government+policies+for+entrepreneurship+development+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_off0000f084.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF084	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010896.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10896	17584 bytes
SHA-256: `35b1982bcf0bf6c862284c2896ef47e1c805da5df5a50237e1907f0fb1b57f20`
`font_02_sfnt_off00013677.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13677	10928 bytes
SHA-256: `a1c5a9294435130a9fac964ff258c7866d036b4ad337784c846faf90daf47b4c`

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