Malicious PDF — malware analysis report

Static analysis result for SHA-256 936c08dbb2726bf4…

MALICIOUS

PDF

70.0 KB Created: 2021-09-02 10:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1365a896505d14c94f25b3e5acf424a0 SHA-1: d9bae3d1cf01041b06180dd91fac18b5eed5a4b2 SHA-256: 936c08dbb2726bf46ef9ea7999e52b9ee6a269415f0ebf4acb0fe418fbf13a2b
184 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, employing an image-only design with clickable actions to redirect users to external URLs. The presence of embedded JavaScript and numerous links to potentially compromised CMS uploads and disposable hosting further indicates malicious intent. The primary goal appears to be directing users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 70 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://crysiq.ru/uplcv?utm_term=differential+equation+with+modeling+application PDF link annotation
    • http://pevak.info/UserFiles/File/36899992242.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071281272e9b---75952422365.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/82887115317.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de6b472dfa4---tolunusezeruzifudor.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f19f42a9bba---gabukisa.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c692762252---95775882600.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/sozulawuwumapewapekar.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/19153141479.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/90127545099.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfc04c2f4---25863224653.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/34724849617.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/77042109718.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ed736096114bbd6a02e7f75bae8baf24/81441890712.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/firazotibokuvufumuvotul.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/60399847546.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/47862319641.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/4692196310.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/34902714881.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/65110791310.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/81705639367.pdfIn PDF document text
    • http://safetruck.gr/images/file/noguwifigo.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/wulixifelutif.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_off0000b472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB472 11232 bytes
SHA-256: 03cb6e9600ca8f2033affb851ff6451a59c71f82ee7d53351d79110972855811
font_01_sfnt_off0000ce19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE19 13656 bytes
SHA-256: b1a773d064bc76f4d9f01151c6ad23d88748a29e66381bdaed9b357c968414ec
font_02_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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