Malicious PDF — malware analysis report

Static analysis result for SHA-256 460eb5c4b9546def…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 12:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e37b6077291da39545a4945af3cecce SHA-1: f4f26679cacc2f4968ddf49be40f19e0fc336a6f SHA-256: 460eb5c4b9546deff308c65458908ac00de513814bd78aa1493a1c7a0809cf6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tebofuxutakolenimenaxolab.pdf In PDF document text
    • http://astorandblack.net/emailer/userfiles/file/kagiwow.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/51635423585.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/24024039063.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/ravexururokikemel.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/95652911824.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/xemepukaru.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/68628248218.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/49397493609.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340b988a926---91841266623.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/31150738431.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/rajoguw.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612efbdd1efb6---75962868136.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///potanod.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/xobavagufifavitubez.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/57979691127.pdfIn PDF document text
    • http://lachina.cn/upload/file/61235884751.pdfIn PDF document text
    • http://tid.vn/upload/files/numeniwirugolanot.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210908091618.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/80932530448.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/br3b59r77v5o2o3al27j4sm2nl/65936849840.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138e355179c9---jonujemodujejufanorof.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/54508979585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sniper+elite+3+androidPDF 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_off0000b910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB910 21736 bytes
SHA-256: 0cc2fa10b1999b68922b283a9c6db92d52346b88b18d7c975dbba8857bf48c10
font_01_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 10464 bytes
SHA-256: a662df08a727ab5746995c8e953f45f12cc38f34eaf1b6ea5bf18c87195e5afe