PDF malware analysis — malicious · 063c340a752397f0

MALICIOUS

PDF

69.4 KB Created: 2021-09-03 03:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 46e6e17c1fcad502ac5ca2cdc41cd55b SHA-1: c504ff05a56185b6f73d6653b2ae99c5491eeaf7 SHA-256: 063c340a752397f0fc4c1f36ec3fc95948c3418d6df6552d2bd49b2e69a8e6ce

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous embedded URLs, many pointing to potentially compromised CMS upload directories, supports this conclusion.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://transbur.ru/admin/ckfinder/userfiles/files/73433193939.pdf In PDF document text
- http://matsusushionline.com/uploads/files/nomejajexinero.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb0fdb2b0---97614503044.pdfIn PDF document text
- https://arichaindia.com/userfiles/file/1773371261.pdfIn PDF document text
- https://learningsolution.ca/userfiles/files/48070630574.pdfIn PDF document text
- https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/990f7f3b27feb669d1f025d8e5321fc1/bigabazefejofotajeted.pdfIn PDF document text
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6349ab2079---gariti.pdfIn PDF document text
- https://andhimazhai.com/images/files/vebipoxusibe.pdfIn PDF document text
- http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/4895761087.pdfIn PDF document text
- http://megat.pl/uploaded/fck_files/file/famutixanutegetaga.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbcb887f0---vobuwijanexerives.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2a0049473---paweporokaxugebibilukapa.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1543d95976---raxovidu.pdfIn PDF document text
- http://webcertain.net/contentupload/fckeditorUploads/organization_/file/94786054631.pdfIn PDF document text
- https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/31e1fa094afe401afd98571ab46d8064/7380942319.pdfIn PDF document text
- http://netmutum.com/userfiles/file/lujolaxobexoniveviludezur.pdfIn PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b315b98c---zamirasagomexilemenegariw.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qhf786i1tr35cumvv19mcioe84/mulamit.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6c7009560---mukidawupo.pdfIn PDF document text
- http://przychodnia-felinskiego.pl/uploads/editor/file/kamebivodajep.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd7cc6d48---levakebenezowoduwekulaz.pdfIn PDF document text
- http://www.mueblesgamez.com/ckfinder/userfiles/files/dipurefetubutojupu.pdfIn PDF document text
- https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8f70a4c96286ca1a1b5684c68ab30125/3042327639.pdfIn PDF document text
- http://greenlivinggarden.com/htdocs/UserFiles/file/48517539327.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=surah+waqiah+in+roman+english+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_off0000b27f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB27F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ca96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA96	11256 bytes
SHA-256: `2699d3faf50e382a9b98beffa839ce45ad080fcdd3234df62cd7ac38bf20622e`
`font_02_sfnt_off0000e444.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE444	14360 bytes
SHA-256: `e97e49805d6872a89881b2b5e9a2e54ed8d06e4d0dab28dbad20b96ae861be33`

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