Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11ca740b8f6a917…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 12:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6b016b0109108b5f4875bb6dfe714bf SHA-1: 987a7edf31ffffa8b23625ccc3d3eb6db2832d31 SHA-256: a11ca740b8f6a917c7c04fce6a4bce842ca617957feee2e2a6ae93151c8d70a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest the PDF's primary function is to facilitate access to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crysiq.ru/uplcv?utm_term=breast+cancer+self+exam+pdf PDF link annotation
    • http://almar-bus.pl/userfiles/file/kagenusekopegudowut.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/010231419821.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c58f0571818---29220413938.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba04a9f1b---kokuwenu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2cad2a38---baguvow.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/73221776214.pdfIn PDF document text
    • http://halaljones.com/uploads/files/fafep.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a5dd3a36ea9952fb5347d66486565d74/neferewuzewo.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/fivovobupagobovawefesaze.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/vaxapidopalomisujilolu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd91b938ea---nugura.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aad4cc2dc---97616379346.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/38964124039.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/vufuridakebogiz.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/28957419618.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/bee50903ef2dbc0c5609724fed3540b7/xapomowolivulopowufobuvi.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/16654dad33e002099da92a8f779f5f74/49091309520.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/fugafuz.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a10d079e---tatikojexupavev.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gilegoratagak.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0m0t6rfdfqhncrn7umj125bnu0/budixoburazuzopig.pdfIn PDF document text
    • http://akademibt.com/resimler/files/96506886677.pdfIn PDF document text
    • http://merwepizza.com/upload/file/pitigaf.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_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 17436 bytes
SHA-256: 6179b157a31b80b8d6af9026ef399ba8b3b31bac420f29ba5a19cec85899ccbd
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 10724 bytes
SHA-256: 7005417d8660617862bb26cabd6852e7dbf3c5f6d03ce245973bf39dbf75240d

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