PDF malware analysis — malicious · b4da52ed2002fbba

MALICIOUS

PDF

90.1 KB Created: 2021-09-05 19:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: b58e229a5199669bc5fa8896507178d0 SHA-1: c162b10401704b50171e3f78af5db1c06c337300 SHA-256: b4da52ed2002fbba59b715e88094f04e82c00cf9eea39111a57e67008d9b91fb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 https://pistant.ru/uplcv?utm_term=manual+fusca+itamar+96+pdf PDF link annotation
- http://yjsyrj.com/userfiles/file/26392019568.pdfIn PDF document text
- http://giustizianuova.it/userfiles/file/35384656976.pdfIn PDF document text
- http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/96047347484.pdfIn PDF document text
- http://hbleg.com/admin/userfiles/files/jaxaso.pdfIn PDF document text
- https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/106b8a5532c4b27794af6670df3c635e/raxotani.pdfIn PDF document text
- http://vitalbafitnessclub.eu/userfiles/files/ketezebosofirukipex.pdfIn PDF document text
- http://nuraski.pl/wsg/userfiles/63170208816.pdfIn PDF document text
- https://bnbcostaverde.it/userfiles/file/vesosujido.pdfIn PDF document text
- http://klimatyzacjaradom.pl/userfiles/file/jerofubid.pdfIn PDF document text
- http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kubidelubevesavetanojag.pdfIn PDF document text
- http://mokshadhamnepal.org/userfiles/files/43774268897.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefcfe5308---tozusifajegi.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/762511d251ddb4b571ff9b382e0848ce/86624399786.pdfIn PDF document text
- https://ppuhperspektywa.pl/files/edytor/file/wilegomututanoragapigob.pdfIn PDF document text
- https://rubyyadav.com/nbloom/fckuploads/file/rakina.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9de5c502381acc4755b74f3fb40513c0/kozadezomunetadawagorafol.pdfIn PDF document text
- https://ferado.vn/userfiles/file/xafesefuvo.pdfIn PDF document text
- http://sahamit.net/userfiles/file/kavoluxopelez.pdfIn PDF document text
- http://heninrealty.com/userfiles/files/43834278095.pdfIn PDF document text
- https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b33f395195e5c0de115a0c7fca4dce5e/2107076564.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871aa3180b9---dowenipiletikojer.pdfIn PDF document text
- http://liily.jp/upload/file/20210720072113.pdfIn PDF document text
- http://amphorabeautyclub.com/campannas/file/74424138484.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1d3ade3bbe6e827298c5f02a98da00c6/xavaxosomixunuzixamit.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f45b77ccd---zoloma.pdfIn PDF document text
- http://abwgulfport.com/uploads/files/winetaliril.pdfIn PDF document text
- 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_off0000efb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFB3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000107c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107C5	22016 bytes
SHA-256: `c96f210a763a3360962841157976bd990b8928788416bc2f38e7d0ccf0ac8295`
`font_02_sfnt_off0001402c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1402C	10960 bytes
SHA-256: `92f4503f0e532f6080f58129d6ffe85bca5d29c9cb0b15cf4a3d2128a529a2ed`

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