Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8fcaedf200ff05…

MALICIOUS

PDF

68.1 KB Created: 2021-09-07 14:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24b865121b72e725633c7a5ce676148e SHA-1: 4dcff4f0b4b833f2f0c927fb965f76a3e0ea1b17 SHA-256: ad8fcaedf200ff050ed8554abee21c765c9ec81cae44ed25c3a4370432cecaf9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it's an image-based lure, typical of phishing, with numerous links pointing to potentially compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 2 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://laborke.ru/uplcv?utm_term=cuckoo+sandbox+pdf PDF link annotation
    • http://reutlinger.pl/userfiles/file/tidedaz.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/71121305388.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/20190753361.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/38173952042.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/gofid.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/61fb43d888629de36947fe6370bb35fe/nopow.pdfIn PDF document text
    • http://attlas.center/userfiles/file/vazogele.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9f2a4330---gobabokisoduvusakeseg.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cbc4819a47e840b933f8abd4f09712e0/fofudoxoj.pdfIn PDF document text
    • https://datajournonepal.org/files/52860108041.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ba66386c7e415677c15b859c6a373098/23863567651.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/40f8f1e83abeb5b999cc0f9492cdb861/94524132276.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac36b35679---3889412062.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/2e6216e42bd22b9ad94f65c9dd5a92ea/1494919346.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/tuvesik.pdfIn PDF document text
    • https://goldenapp.net/file/89767284837.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210724101213_1ygk7x.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/keduvapukuwugekavofenut.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5de3361f---55286502527.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/23789568798.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/27701255787.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_off0000b061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB061 10608 bytes
SHA-256: 2ad5b5289b2aff63a2087181f9e7ec7f5de81ae3b7432adec02a0fc47cd6c53a
font_01_sfnt_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 14080 bytes
SHA-256: 9e33a3941f3b80c008417799059981d708549014e7325fa70f03326ddafee22d
font_02_sfnt_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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