Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac60e3d6eac7f6b4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-14 10:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40df7a8517e1b466c0453d4efd841518 SHA-1: 6ba3a7d6bb19034caa553bea0775bd1c331604a9 SHA-256: ac60e3d6eac7f6b476069418c4fc2e391ca1ba3af921aa3c1602b41318d204b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, potentially hosted on compromised sites. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://zaintik.org/files/galeria/files/bosedaxidopogisob.pdf In PDF document text
    • https://dailyiat.com/html_upload/file/papozanakisev.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367a350ce63---rulin.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370e071552c---5797138792.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/75427059791.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/25312482117.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/67831303450.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/54138644745.pdfIn PDF document text
    • https://aneri12.cz/res/file/sezuvad.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/bunenela.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/90741827306.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/wifavemefuwomuremisudola.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e622296286---xamoridewajogatavasixune.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/bamemodivavapopuwuj.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/mabol.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/birowosibinejupiweru.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/gotakirowibowopibenonaz.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/sapagabopepemusuxiw.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/gojedolisepujaku.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/o4nj3qtq2k2ln56tcv5jhpcai6/xebirija.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/zusofu.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/31252177428.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ec75882d0a2c37104ee01f6c951add16/xajajotudifodogexax.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/40429728018.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/40963955648.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/37455735529.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202108311930091063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=be+going+to+will+exercises+pdfPDF 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_off0000bcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC9 16372 bytes
SHA-256: 6aebd657e72c6f636c0c653ea1e4f8c2cd50cc66442b88b30b56aba4c7b51254
font_01_sfnt_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 10876 bytes
SHA-256: 62937bdaea7c9b09d441d70eb9b35572dd728acff51d64587f55842c3656b4d8