Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7529462a7632152…

MALICIOUS

PDF

68.2 KB Created: 2021-09-30 16:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e224e252557157e74b6357f3ed19a0d7 SHA-1: 01e3c6aa73ea98347e40e89356489e879e8a2488 SHA-256: f7529462a7632152cbedc08bdb47d1c22eaf28a0e8e96c2b9f71b1d97ee35738
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, including an image-only presentation and embedded links. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially compromised or disposable hosting, suggests an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a downloader or redirector for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 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://www.khaosanpools.org/ckfinder/userfiles/files/32780976638.pdf In PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/87234375149.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/webotozujumukani.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/wegawalutukidugofapomaro.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf941796e9---71310675283.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/58180175350.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/80990187990.pdfIn PDF document text
    • http://africahistory.net/africahistory/upload/files/wemumideweb.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614407205acd4---49274004621.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/laputoberujaf.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6c0607e9c---rebupo.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/28347385787.pdfIn PDF document text
    • https://bloc-immo.com/images/dabekepafidolapujobewuwu.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/77418278407.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/nugaz.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6c8549629079ac71773007ebec5eee00/52621077608.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/padixipi.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/28828009052.pdfIn PDF document text
    • http://opsir.eu/files/file/84683767951.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/18952220385.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210920060233.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131859884017---kurirelezekumosekuju.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/zawub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=my+hero+academia+games+apkPDF 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_off0000af08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF08 14136 bytes
SHA-256: 9c711f00c686607c5dac7505c33eb845268d5a69fdda09d125a432d154bd3d36
font_01_sfnt_off0000d23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23E 10912 bytes
SHA-256: 7d1d8a815007f3fe7294950600bcc26c417e33b04773c826ac4e8280bbcbc542
font_02_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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