Malicious PDF — malware analysis report

Static analysis result for SHA-256 f645b3b38324c393…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 05:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ecec86d0c260c6f72118b5d400b80fc0 SHA-1: 9db57c5a709f51bc3f1124811de98b5860e17a1e SHA-256: f645b3b38324c3934cb377e7aa95a98fe4380129bcac967446aa346045f8b8e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://lalicorne-hotel.com/userfiles/file/daxuzag.pdf In PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/gdu9hq60kahbdlf90hjnaud7ts/xededilorodimuga.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/ziwimadotevefijopa.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/18115150658.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364a720283a---82312529830.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/89291298754.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-7/20210907034540107897.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210917223033.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/setukesobupuzozogog.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d14a5cc02305519b5ccc43aae3ae00f7/84179087367.pdfIn PDF document text
    • https://defi128.com/userfiles/files/23184642937.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f896a1b73d---kiraxuzobep.pdfIn PDF document text
    • http://dd-eng.com/files/files/sidanidavanusapa.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/12316721738.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/77253550763.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/nukuxewezetegodezaxadi.pdfIn PDF document text
    • https://advik.net/userfiles/file/samoxusagexuzed.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/mitarigowerubuginu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xofedurasab.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/25691430106.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/vagamanexo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133a60075db5---jiludetamapabokiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+1+carx+highway+racingPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 10540 bytes
SHA-256: 6ade84aa6a08159efd647ea0fb3722508eb5b3a766d6efa40d473e1508ad3b6f
font_02_sfnt_off00010d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 17784 bytes
SHA-256: 3e12ecb0f92045070b55b69ec7817d1690902fafaa875b9dedab07b6b11be9d5

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