Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b38af7f3cb169be…

MALICIOUS

PDF

97.3 KB Created: 2021-09-01 09:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20c79b1d03e503d96b0f5906dfa90729 SHA-1: f20f0885d6335e4aa95d206e5755738b94660809 SHA-256: 6b38af7f3cb169be36545bf46fce2a9e07d84d64fb920151e700871d3a969084
192 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites or download further payloads. The presence of a visual download button and QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=st+michael%27s+church+linlithgow PDF link annotation
    • http://daiichihousing.net/uploads/news_file/68695565442.pdfIn PDF document text
    • http://4bx.pl/public/file/zajexatigavebaxariguvix.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/39603984946.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/dopowipoxepenurizaguxevev.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cdfa712c6e82dff6fdaa724763516d1f/11574999140.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b46h8ie25me4jveuffb69q9r4/87538138701.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/20174122859.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc13c340a---kofadegokujuli.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076ad5def52d---37201797887.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/gulovum.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/39131680116.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/zaxelaku.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907f92c1aeb---pesez.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/61852532314.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kopuzibazakote.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/51043264914.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4feb56780b---23244477246.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210804090152.pdfIn PDF document text
    • http://school15-tyumen.ru/f/44136984456.pdfIn PDF document text
    • https://bloomeng.com/uploads/boxawini.pdfIn PDF document text
    • http://greenbrier101.com/userimages/72703387408.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/70532763089.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/92263130130.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_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 19156 bytes
SHA-256: 4951adc446984e00fe962ac0cc049e091a23b58e130af4588fba977c4ffda582
font_01_sfnt_off000145d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEC 10972 bytes
SHA-256: 7f5baabba3bf328acdfbffece10292e318d8d8405971daba2180920a94652b42

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