Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8adf4e3cd19f76…

MALICIOUS

PDF

81.3 KB Created: 2021-09-24 11:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bbe4980ce1ffc8b8f70792220011b7bb SHA-1: 35e5ade6a47f2ed5b281204c994c5fe359ebaa65 SHA-256: ac8adf4e3cd19f76a681b4ec7677b845278e29984ca209fae1fe088ce4bb793d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://allytemp.ru/uplcv?utm_term=watch+it+2017+online+free+now PDF link annotation
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/degujagapasavumesujudu.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/82045682663.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137aff735558---ketovebetadexa.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/82270569601.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c138dc692aaccb421f5d0212042100ed/belimozaxadisiboxomile.pdfIn PDF document text
    • https://menu2uplus.com/images/file/relizomokima.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/76256307247.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-14/20210914021236348619.pdfIn PDF document text
    • https://manenshop.com/upload/files/kabijejavijazizanowomozol.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210910185621.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/degoxatujelujetuno.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a37a6d64bbb8e16453ffc8e56e2d5c4e/xomusufawoponidubelow.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/6234177138.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/16184435766.pdfIn PDF document text
    • http://halanmilk.com/upload/files/4226825706.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/dezovobuvixoxevopazu.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/lesufiwuwetukurogulimivu.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/ganududopi.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_2D3896F37D46F095.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/48641468017.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc5c87e185---93542080358.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/detipa.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_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 10688 bytes
SHA-256: d2ea9d88b1ac1f086be4a5939a7b64247e8be3b8d2257110891ea5c2522cab93
font_01_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_02_sfnt_off00011f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1