Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c17ea64861dc10c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 16:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2859e92b9165ef9f7418517dc5ec836c SHA-1: 1a0a77ccb8f2d15569722e90733b175f870afce0 SHA-256: 4c17ea64861dc10c2df7ebbf237f2ece3f80692d07f4e1911db47c5cb8f798a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://loyallcanada.net/editor_files/file/45766870379.pdf In PDF document text
    • http://www.motionmantra.com/userfiles/files/59680220127.pdfIn PDF document text
    • http://knipia.com/userfiles/file/79694593048.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2f6e9ddd---tofila.pdfIn PDF document text
    • http://mp-journal.com/media/file/14348977778.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/gopakudadisagoxetewo.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/6435663377.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/mivusoga.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210903212416.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161375fdb0b08b---25312892186.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/24e6og8tjbfhdjbv1eihocetpl/80277660913.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/48559892377.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/zijadodomazotumepetiwara.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/5010278784.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/45145082871.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/bunezaxenegavimegipi.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/vomeguvesukug.pdfIn PDF document text
    • http://erimti.com/userfiles/file/lokefitikokakilino.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/doxasogafagonuzifik.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/81732104882.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/fuzajufuv.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109011359274021.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/wovuxutoninojikaraf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=canada+visa+citizenship+forumPDF 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_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 11096 bytes
SHA-256: 910ad65aecf3ea78e140bd95309f81a816aace5823026c21c3bb7bcb883dc8c5
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 17760 bytes
SHA-256: 333bce0c5dc93376a5337dc0ca453a6befbddad4c6054f7349d196cf1d3109e3