Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f32821d1837b64…

MALICIOUS

PDF

86.3 KB Created: 2021-07-10 03:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 63955030f92dcaa83b0349f2e944a7e3 SHA-1: 19cfade9b870751e36ee71f58735dd753cc3b3c1 SHA-256: 75f32821d1837b6470e451f4c3cb8eeb39f1af8ff8bcd44b86cffe4a793e98f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI links and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=how+to+change+a+pdf+to+black+and+white PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h6on5b115fehe8blcre2s790e0/97033615603.pdfIn PDF document text
    • https://4appsoftware.it/file/rekovafibanutoligonanagu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e61081e8ff7603079532608ce76888b8/wivesopiketad.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/98619739d62b034698c6a842d62b7d14/reganesoge.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7592b12f7f---mefuxogaxi.pdfIn PDF document text
    • https://argumentua.com/i/file/96898614979.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e5256f22d---89508629353.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/88306903da2610127f64d16d363bc1ff/kukiperalokozugoxabo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c4975f68cb2a76cc9ef260f1bdc6143e/movimawabilonopun.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b41dbb6158e---38496009349.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/bigad.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/5222896505.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/knvaitagind7b3g58crc8qhf85/34146611795.pdfIn PDF document text
    • https://mytopics.it/uploads/file/jorogekopiroz.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/sutunaderunugibubulavonu.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/farefexegipelepuduveg.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/90656856872.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/v1kad706ceuj9sf95th6560mi3/21256904439.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/2nm957qtjkrpodu4v9g5ae7iqc/nuxubirapowowovukesaxalo.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/20896070598.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803e70b38f3---97498302300.pdfIn PDF document text
    • http://sport-way.ru/img/file/82944779049.pdfIn PDF document text
    • http://proxima-design.cz/files/file/97129035192.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b578557e3---40169679249.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_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 16820 bytes
SHA-256: 9ea865cec9066df93eb6d29dd778185b013be97432aabf4beb0c70e60c8bca73
font_01_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 10940 bytes
SHA-256: f7066296d51fd375f219d9358573f45c6d8070856cc74afacce9ba566a4a4f1f
font_02_sfnt_off00013392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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