Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ca4418acf2dc58…

MALICIOUS

PDF

67.2 KB Created: 2021-10-03 03:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3715dfede0e4f1e9097e68b9cea70dbe SHA-1: 19ee6659faeeb6b22d696efe668e512aa2a9a7e6 SHA-256: d9ca4418acf2dc5878104d1d58ae49c4caa397bd96981846d5c57cc8500e5538
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate it functions as a link farm, pointing to various compromised CMS uploads and disposable hosting sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a malicious site for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vntsd6l6152a3qdnhgsrja4hf3/sagalotebumot.pdf In PDF document text
    • http://mopron.ru/upload/files/zozagug.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/37548237738.pdfIn PDF document text
    • http://sadvita.lt/pav/file/tavekabupikalina.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rlu41ptl1de96f2frcfc176k34/lotavuvajodida.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/28754361568.pdfIn PDF document text
    • https://pansky.ru/UserFiles/File/wonexat.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobit.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc5eee69a5---fokujapuwi.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/toratagaleku.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/89709374917.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/52866303961.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/45721207710.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/78998375769.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/19854917364.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/8364284585.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/xexujajepakukaperipovut.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161360327d086d---dogovogadogatedifumujab.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ed6d6d06f1daa31ae02cd460f4a53946/kudujazam.pdfIn PDF document text
    • https://alohasafaris.com/files/61600950176.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/sanoxamagowuradufejate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=polio+drop+discovered+byPDF 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_off0000aca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA9 10464 bytes
SHA-256: 14267e2b6b04306502800b0dacca6daaa6a5c46d7e1f6333c85e7e967bc543d1
font_01_sfnt_off0000c448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 14260 bytes
SHA-256: 9593fa55b28be089299afe40ff83d9165aae20a95c68c1f46a71b040f8a58a35

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