Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e9e5a00160ff41…

MALICIOUS

PDF

92.2 KB Created: 2021-08-24 18:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 121f4f50412f2f9640be4839b6781a38 SHA-1: bcaf706a59040d3cd1edb412b5db91770ece0a82 SHA-256: f1e9e5a00160ff4183b80b17b642ca1a1466027aae898b71a5ef2e3bd554e5fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to websites that appear to be part of a link farm or hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://ticaproduce.com/ckfinder/userfiles/files/jusuzamapijamir.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2d7c133d25f53671f8ea2b28220bae80/nifotoxobipaxuvugubemikod.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/losezovafurubakewiwa.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xedapenuxojoxoxabolepuzo.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/kazovajisusum.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9f517109e---jejugumokonawagivajuliva.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/21552631978.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/zoxupifu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49eddc3f38---zelesoze.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6736d26beb3d37186ed8f3f72a9fba30/jimifagetukitejexeri.pdfIn PDF document text
    • https://anfauglir.com/images/file/66008610416.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0d1bf10e05d64e439b3873e59c4348f7/20707024525.pdfIn PDF document text
    • http://tianfonmm.com/d/files/zonuvidobonokenukelisef.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/wulipezabimevojekugutepak.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/71286597405.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8b81b718---kituxonaw.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ee358b3af0f02199f02b98eaf0c7ecb1/gemefuzomerafi.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/fufabafofugulerugaze.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/22904642001.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/nowowib.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf5918248---69701450981.pdfIn PDF document text
    • http://huiking.cn/uploads/file/200655107188.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc58eefcf---jafojujodifagojem.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5dbntg9skl2emg6nv73v915jeo/zawaviki.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115dda81642d---68652745100.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/60177034055.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609488edadd37---72012247545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+is+the+difference+between+celsius+and+fahrenheit+scalePDF 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_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 10772 bytes
SHA-256: 7f10eda103b2d35b2545d22c60a79f348efb63379040b732f265c8001cbc2366
font_01_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F9 17908 bytes
SHA-256: 29453a8c8887af64552e97dd1396b0e7f1849ec0bcb63b99bc173a480420067f