Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89aacffdcd73a1e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 07:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d7f89a681ed0380692731d73f4cdaa0 SHA-1: ab41999856cb1dd1d36fe261f9abf70b2a17bd19 SHA-256: a89aacffdcd73a1ec756e2b77cddc2e33d96af64f94b79ac590ed9621abee99d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=fare+foto+a+360+gradi+con+android PDF link annotation
    • http://katela.net/userData/board/file/69335085881.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/vowenikoletalixarigux.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/3234953596.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/56382101837.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/jevedan.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/kubegil.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/betumexufejiman.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/85900390281.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/25382231719.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/33296226890.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/xinubovokakosenemunejoni.pdfIn PDF document text
    • http://artediapharma.com/upload/files/gikosimixeli.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/28835633479.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/59790044135.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/96686005256.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/61839963910.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/mizevame.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/97559304143.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161392f54b536d---49568023101.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/8871438388.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4fde1b05---76180945345.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb4513e1b4---31650923434.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/39170569801.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/9993610552.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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 10876 bytes
SHA-256: af1b5d46e2315d4f8488663a6e29284abb9ecfac28a49c46e113605c73c905bb
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 17348 bytes
SHA-256: 1986065340da5599a3df5a5ea612ce09768e29d8e2be7a9229f50e0af61b2865
font_02_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1