Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31a0025715dd3c9…

MALICIOUS

PDF

81.7 KB Created: 2021-08-18 03:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dcde7fb4c2915aaf0cc61173cfdec1be SHA-1: c2266167c3a6b35797308a53bf2f94f5777724c2 SHA-256: a31a0025715dd3c9740cfe40f24546721901a7d6e4b90637aaaad1ef609eb03c
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan delivery mechanism. It employs social engineering lures, specifically a browser update/extension installation pretext and a password-protected archive handoff, to trick users into executing further malicious content. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to distribute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://tepihtrava.rs//files/nujab.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/7ib61mkvs02di5h5fuehm9chj6/77382232442.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/xotonuz.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/79231857416.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/80fc5b5eb695f6678e7f71ee35cac1f0/juraxonumipezuferatogenim.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa41c52de8c---lelixavefog.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/sidujoloxobuxadonuzam.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/lifevidofusaboga.pdfIn PDF document text
    • http://tencanpowder.com/d/files/87990253554.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/wodumujuxexogenizulukuk.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/dawedanediravomanafujevuz.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/bonukedotadovivatoviloji.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/idi44e25fa6enpg8hao6p9pg25/pebiwene.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f222c4dd4e---20125301842.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/vogutinukitigamozufat.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/97599863366.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/milukano.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/nezesubixuli.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/e2bfe3adpffrh4runarlh9evj1/gibuvipileletoti.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/42849644058.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f351bdb840e3f17f9cdfc4991a1aae6d/rejubopupexolukem.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/hkj9hfp405bf0t00l23cfl3hv0/30187095426.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/45775730237.pdfIn PDF document text
    • http://www.fotoliaIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fonts+copy+and+paste+for+robloxPDF 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_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 16152 bytes
SHA-256: 442feda49f05d1bbf828e2ea735b8ddc828508c98b3a6f4df24e72f6fcf3bdeb
font_01_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 10856 bytes
SHA-256: 188249dcee236d2b018cff1288b59b2e64a05e8bf363970fcde6da348a48df8f

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