Malicious PDF — malware analysis report

Static analysis result for SHA-256 a046c11fd60bd61d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 16:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7dee4ef29768bc31301eba73a4adcdb SHA-1: e2ae73d23f68beb81cf7b014da4c262311dcf710 SHA-256: a046c11fd60bd61de21e7e526bfdf37d4befd9660f4db48ede58fd5376192b3f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting, suggests an attempt to redirect users to malicious sites or download further payloads. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick users into initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://solidpractise.com/files/userfiles/file/wisalibesenam.pdf In PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/22080998612.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6dbba0b0a3390b470ad48bfc04c2b1bd/55643259957.pdfIn PDF document text
    • http://adveotec.com/img/file/4746681353.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/05qmgtuufkf8f4s5kipcu4fuuo/vudesijenowonixupujopojix.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/fosofixikobud.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/zonobigekigugegekurumijep.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/22001089285.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e18eea9154---pedelaxoliniposan.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aff9962be---foxunijagu.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/jigotijevobapilu.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/gopesinajujili.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/bumexeki.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f21737a93---tixumawovadajuzonef.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b5485349---847913576.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083edbd501a0---13239073197.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070693c90bbe---zunezivuputumu.pdfIn PDF document text
    • https://arerp.kr/data/file///palafuzebirigiwu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/11146109728.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160faae002f02c---20492776048.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c676c1b3dbe---58930924284.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/47788743377.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/liwuliwetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=aplikasi+pengubah+pdf+ke+word+di+hpPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093087ebf1e7---mikurixufafetubamamak.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.

FilenameKindSourceSize
font_00_sfnt_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 18216 bytes
SHA-256: 1196c70c2cae48f9b893edbd8b5cd75c9c93a00514e3f320dd610a22b16c4671
font_01_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 11080 bytes
SHA-256: c24bd3cfd8d19be2b71b56ca0be69edaab0d4183cfffd8f95d86a829371debe2

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