Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b8612e94681c12…

MALICIOUS

PDF

68.4 KB Created: 2021-10-03 12:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b14a04c2e98f8ac344c17b8dac1af56 SHA-1: 2b44430d9b3c4ce494aaed0c099e788fa81a7cbf SHA-256: d5b8612e94681c120495e21581291941520aecfe9198bb9267ca04aa5e50cc95
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan delivery attempt. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories, suggesting a tactic to host malicious content. The document's structure, described as an image-only lure with an action trigger, further supports its use as a phishing tool to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • 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 68 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://synerhu.ru/uplcv?utm_term=harry+potter+game+iphone+cheats PDF link annotation
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67aef1341---31931981963.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/28156589462.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/xutufobolatapite.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153fd845252c---wetepipukuwuxafubagelogit.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20211002_235623.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161539c06e06a4---mexukaso.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/92578787824.pdfIn PDF document text
    • http://wernitznigg.at/files/74046059298.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/ragifenedizunaba.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/sadal.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/wowopokebabe.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/45689803486.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a236b76cceaba5ca03d1d5d89c9ceebc/fivuvun.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/59071162374.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/wojawimavabewege.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fujivesudemovibewuv.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/68988974538.pdfIn PDF document text
    • https://kvzriu.org/images/file/doxal.pdfIn PDF document text
    • http://birdwatching.sk/media/file/rimejawinogaxiparop.pdfIn PDF document text
    • http://baove24h.org/upload/files/36862511385.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6e707a4a---lunakiwavepenivonaxusuven.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/60678123226.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/735958972.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e678e6f08---dezefetadagigawuri.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/22109334244.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_off0000b045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB045 13840 bytes
SHA-256: 98e3a56516815b6272dd115f830ee971277b188866f36d5f2323323c7c53ef9a
font_01_sfnt_off0000d2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 10880 bytes
SHA-256: f74028c7b89e1a58fc244405cecd85cf7d701b09e23de233fa64fb982267edb9
font_02_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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