Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5458ea50e006af9…

MALICIOUS

PDF

68.0 KB Created: 2021-09-17 12:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef49e362809744f307769f0c4741ec3c SHA-1: 044f745a6c66770c56c9b72f346edae44a5d8b75 SHA-256: a5458ea50e006af9974bce18c731849f34e4d0b8b1b5fd6519ffbb52ae01c939
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The PDF_IMAGE_LURE heuristic suggests it uses a screenshot to hide clickable links, a common tactic for phishing. Embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, further support this. The primary goal appears to be directing users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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
  • 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.
  • 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.
  • 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://sklep-pinokio.pl/web/uploads/files/95999426880.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/faf92a12c4e321a02b6987d02b7f0c5f/pasafexawuwutibij.pdf
    • http://obrienbuilders.com/userfiles/file/27514094136.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/lanenewobugogipapas.pdf
    • http://easytravel63.ru/ckfinder/userfiles/files/kegesalolebolanoxiganu.pdf
    • http://acm-medicali.it/userfiles/files/57744822343.pdf
    • https://dichvuhappyhouse.com/upload/files/vupagirimosenodu.pdf
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/85517861338.pdf
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/kerewoka.pdf
    • http://ropesadventure.com/d/files/28669295774.pdf
    • https://codecs.ro/images/file/14286992281.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc19b449e---47143872820.pdf
    • http://gaishachuukobuhin.com/js/upload/files/kupeju.pdf
    • https://khabul.mn/mmpa/userfiles/files/53280013044.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/migejari.pdf
    • http://furniture83.com/upload/files/makulelur.pdf
    • http://interstyle.org/content/xuploadimages/file/74256227419.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d50ccf1416---xekujurav.pdf
    • http://hrdiborice.cz/erucom1/files/files/84661841145.pdf
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/wosomegegob.pdf
    • http://www.tractortools.cz/ckfinder/userfiles/files/70217053742.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruxid.pdf
    • http://thermogroup.ru/uploads/files/83876211465.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed74c04a4b---92654016972.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161410f2985d2c---bolafifojibus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=speed+vpn+cracked+apk
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/rolinebaworesagajemotivep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b103.bin
160fb5b8b227054166dc8840e2fe2168b0df426b7bae4fab4cc9f5a73c00c3c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB103 10216 bytes
font_01_sfnt_off0000c810.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 16792 bytes
font_02_sfnt_off0000e022.bin
cf30f2da06d721bbfbb59e3e7a6ddcd302b5f11a69fddf370405ce6c356d35a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 13884 bytes