Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a1b30fd62b62fc…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 10:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c6cd7fc8589efc09372ec69995ef49f SHA-1: 524419e954b09eca527d0560fd6a23d2d0b337d8 SHA-256: a4a1b30fd62b62fc2e716a900d2e0c4fa65a586608bf9f3f8aca05af4e9b69fd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure due to its small size and image-based content, typical of a screenshot that hides a clickable action. The document leverages a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://canadianrockies.ca/files/file/19316032511.pdf In PDF document text
    • https://mimpi1pusat.com/contents/files/fowexidaxiti.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/cnknh6b6itm05nivjtha6aqo8a/sezinu.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/40985440205.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/kexerujogikejufixetep.pdfIn PDF document text
    • http://com123.vn/uploads/file/lofumebulupo.pdfIn PDF document text
    • http://polipack.ru/content/file/78348308797.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/40503383137.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/milobutobemaweganu.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210927124523.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/2188513239.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/pemejavuzalif.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/gexuwunux.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/simiwavurimovimibodu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bisunanelopojizalatarov.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/af6114f9116eaba177439250bd74483f/kulokenatosukaxelo.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/10313951064.pdfIn PDF document text
    • http://art-ball.net/files/file/6557527777.pdfIn PDF document text
    • http://simonide.org/userfiles/file/53290946469.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/vifitulomin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150964b8543b---gimisa.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/44148886835.pdfIn PDF document text
    • http://gugugroup.com/userfiles/13095760515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=refacing+app+freePDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/rojodazalezirelukatatimid.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_off0000ae8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8C 14228 bytes
SHA-256: 14695480c5322392d9960cb86d62a69d5d854b97d7b15aca562a37b45b236f57
font_01_sfnt_off0000d21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 10268 bytes
SHA-256: 31ec19131e3d859129197c3247d1c2604280bc262d0c931368791d34542d9ea1

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