Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ba3ffcc571cd18…

MALICIOUS

PDF

68.8 KB Created: 2021-09-17 02:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38fc93ecb3efbd80a5fea94118158845 SHA-1: c23380c98fe58578b5a74a9cc2876777a3518c73 SHA-256: b2ba3ffcc571cd183ebc5802495f8d5b61cbba1d188303193585dcfc98cbba0f
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of 'utm_term=smackdown+app+download' in one URL suggests a potential lure for app downloads, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://quaretti.it/userfiles/files/zutupoxopifaxim.pdf In PDF document text
    • http://investgeorgia.ge/userfiles/file/tuwexividun.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/goluxiratanuvelanome.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/vutisugifavosat.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3c464c5cb50baf64795fbb7a62380fa8/giralukulexivup.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/ligetenen.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/dederajafomi.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/532a768da3ff0b3871f9eac57becb474/78243200852.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/41618046573.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/46345623149.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/25817366484.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/tuzep.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bc17b1d4842074cb9e0dad19c8e2e723/61343496294.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/wejenivajejase.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140ebeea7910---zaxutiwamasiwiwob.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/busoxajij.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/49476720077.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/64940344811.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/75280283058.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/39030146264.pdfIn PDF document text
    • http://ativn.com/upload/file/vijupozuperinusajakafij.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/4429376310.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/misudu.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/naduwefunafarubufa.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/58303077504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=smackdown+app+downloadPDF 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_off0000b166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB166 14668 bytes
SHA-256: 2e4d3e28fb722346ea06116f5402be436ce44ddaa9a22eda000fb7f1bdc9f62f
font_01_sfnt_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 10336 bytes
SHA-256: 86fb010e68b034129b0d2f1f7323237c9eb4b02b270597811185ba01a9bd2255
font_02_sfnt_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1