Malicious PDF — malware analysis report

Static analysis result for SHA-256 3576eaf8ab46cf33…

MALICIOUS

PDF

85.8 KB Created: 2021-07-24 12:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d0315a89d3533724b32c91e5267a5dc2 SHA-1: da32b742146553a582a8be0267e15ed98af586c2 SHA-256: 3576eaf8ab46cf33e71789d6053fae108b00e502173a79abffb4c416e9919ab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL heuristics are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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
  • 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://dom-2000.ru/ckfinder/userfiles/files/voxevusuxutekasubifutom.pdf In PDF document text
    • https://its-bulgaria.bg/files/file/88991362459.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ibdqcf8abvm6urann5ktgqp44r/45216795440.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160724eb094ede---84677047.pdfIn PDF document text
    • https://starbox.fr/img/files/rexipemadavirenurolepe.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f124265f9630c6eb2e2057be2affe54e/28952969175.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/6766639593.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6a3c8367f497364d26b3023e26d2cac1/pedinofalazuzul.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/pilud.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/fotexarejet.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/xasimeno.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160867379622f8---pekijedage.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/luzafuteleniwolevejaguv.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/dokanawugene.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/25298228461.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1900c0683---1572429972.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7297a6ffd80bde7920f58fb7da237e85/47470410401.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/39727362792.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db3f639804b---kaxumukow.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/zegifenegetunajawodovexem.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/58698999512.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a38d2b8ec6---97485894695.pdfIn PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/wudixotavelixitufid.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lisaxiguzupogur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+program+my+xfinity+remote+to+my+soundbarPDF 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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 11328 bytes
SHA-256: f1d37d62e0814dce22a719a0629723155725e91ea3847ea5511490d3ea208df0
font_02_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 16708 bytes
SHA-256: b7ccd23514e6db8ad21f3d5c2383cd06a7725a343a748013e8fa8d145691362a