Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30b60176f9c1afa…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 04:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 872d27cb934936e7d9fd03b929c2727d SHA-1: a2c0a1a2620d6380407691a7bd1266eab38a17bd SHA-256: b30b60176f9c1afa498756688fe0da4ce295ba74f79150f8b95791c5278c6a65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of external URIs and a link farm structure suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=tomorrow+survival+apk PDF link annotation
    • http://siamsnail.com/media/userfiles/files/pemurujisilimo.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/89126255198.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/romexamuselizolodaxebel.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/43525133683.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109061636077217.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/rinuzuwile.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141135796904---61421538752.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/728835c825b0f2c52258d5a0bfab28c5/jonolamiregon.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/futafururetunatanajo.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/mupekizofojusutovisuz.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/gesumodoko.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308d1905f6e---44591254141.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161412cb20269e---37427132319.pdfIn PDF document text
    • https://akconta.com/uploads/files/gavajixawevame.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161301b3e660a6---9753544958.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/nigemo.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/tivezutufaguxufimuminikun.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210901165235.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134335b28f65---moniniloxukurakedim.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/larawevebefexotofim.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/46714681383.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/82538424888.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfbb56166e---kukedurenaw.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/824466f89b0e232e59a33d931d1ffdd2/nodagix.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_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 10384 bytes
SHA-256: d834d027edf31afdcf2bbce8670a108ef14a474685fd7a8759b0133f1db7684b
font_01_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 20452 bytes
SHA-256: eafc3da9707aaac658763de8023b6176c0647c9e86e81e4750cea3b159995f0d
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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