PDF malware analysis — malicious · fb08dbf0f2dc64cf

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 08:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 058cb5bee8664c028f0d5fa2900eaf60 SHA-1: a0540423b0239b9ab6288eab61055b9426c75fcc SHA-256: fb08dbf0f2dc64cf7bbd9fc2eef3221615dfb2218a53f79922219d70c8cfa7d7

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm hosted on disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user. The numerous unknown URLs point to a distribution network likely used to host or serve malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://spostojow.pl/userfiles/file/duwipalufuvot.pdf In PDF document text
- http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/371d676d2e46f6fd080784256b20e172/68535105276.pdfIn PDF document text
- http://saothienemb.com/uploads/images/files/38091682755.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608916b435615---tidonow.pdfIn PDF document text
- https://organicfertilizerproduction.com/d/files/66149896320.pdfIn PDF document text
- http://szyldkj.com/luodan/images/userfiles/file/40576033211.pdfIn PDF document text
- https://inoxquochoang.com/app/webroot/files/images/pages/files/3234546718.pdfIn PDF document text
- https://www.orthovision-lublin.pl/ckfinder/userfiles/files/16449940318.pdfIn PDF document text
- http://mutitar.com/user_img/files/2225387526.pdfIn PDF document text
- https://cristalparkhotel.com/ckfinder/userfiles/files/18720596228.pdfIn PDF document text
- https://pioneerlift.com/upfiles/editor/files/50236804652.pdfIn PDF document text
- https://anakaygame.com/calisma2/files/uploads/73738367579.pdfIn PDF document text
- http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6b0361631c28a6fdafc180e52105e4b2/jotimobugobo.pdfIn PDF document text
- http://tfh-filter.hu/_user/file/22870687990.pdfIn PDF document text
- http://kokocurry.gm/userfiles/file/25102936415.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609426bf9d81f---gudalugaradedobizijo.pdfIn PDF document text
- http://zaintik.org/files/galeria/files/76923581544.pdfIn PDF document text
- https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/9f7d2d1bf72764b178561cb8f870e709/23388752767.pdfIn PDF document text
- http://bassbasement.org/userfiles/file/77029422608.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2489b9d7c1ed9a65b07bed5371ba3c08/wowilejotekifizugaz.pdfIn PDF document text
- http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/97735767290.pdfIn PDF document text
- http://theurbanbazzaar.com/userfiles/file/vivulanulovajon.pdfIn PDF document text
- http://lctrading-gmbh.com/ckfinder/userfiles/files/98426087258.pdfIn PDF document text
- https://samarthanamparisara.org/apadmin/uploads/userfiles/files/83938288010.pdfIn PDF document text
- https://ismart99.net/upload/files/jajivezasadopivokolenujex.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+sync+airpods+to+androidPDF 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_off0000d96b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD96B	10572 bytes
SHA-256: `615a94c4979ca18526674e4ec4ba4321eda4ba392a1d0a03e56cb7eacb513ee2`
`font_01_sfnt_off0000f1bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1BD	17212 bytes
SHA-256: `6cfc29b2ddf349ef61413b3691d5491a1357b5638bb68f7a5bcd6b2399af8665`
`font_02_sfnt_off00011e70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E70	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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