Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3b049fa894a61c…

MALICIOUS

PDF

52.6 KB Created: 2021-10-01 03:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 95f2e4d27ba9ef0fad22f4eae89d079f SHA-1: 17f78b5d20b2b539bea652d76755974ca073384c SHA-256: 6c3b049fa894a61c1eb75b69ee20dc123c356a5cdfe066d8cf50b68c4370f8f3
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, utilizing an image-based design with clickable actions to redirect users to external URLs. Heuristics indicate it's part of a link farm hosted on compromised CMS uploads and disposable domains. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's intended to facilitate the download or redirection to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8664

Heuristics 6

  • 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 52 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://holocaustresearch.pl/nowy/photo/file/bujukuberifoloferero.pdf In PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/49851283581.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/12968753148.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/84169709186.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/runajimobigo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/90880d18b7373b188ad78270fbff7701/kogakelatokamimepebivitub.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/remojuwawamumadonex.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/270fcc4b0ae137ad6d50dbb9f03e5d1f/66109823558.pdfIn PDF document text
    • https://fond.ru/userfiles/file/lologezawebezu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4cc4c9083c870fedb66e9eb7e3a58d4e/venixesirifagefi.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/bipavinu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1d28abeb---23846524913.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210925122405.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/milaraki.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/gubazivugonakowovalo.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/39652212972.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/81881548995.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/votikabe.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/dijenerugove.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/72246473917.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4edd638b3bcc71c7470cd7ee5817c05b/robazoxobedekotod.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/59e3a87ed0d9d6964cb1c875efb4c3c7/varopulagexamatuvowuxeza.pdfIn PDF document text
    • https://stauber.lt/images/files/68803583519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=abc+iview+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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