Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e888cefb2a8a90…

MALICIOUS

PDF

83.8 KB Created: 2021-07-20 07:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01ec1bfbbc5c26477a83d1aa16fdddd5 SHA-1: 8f33a69cc2d8fcd89ee21c49f77b86818ae6b1de SHA-256: 98e888cefb2a8a90f5f3bcf02121bc20d2d5dd5cdb0c1ea379ed2a8240097c29
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent. The primary attack pattern involves luring users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160982df8aef47---mukagafisuv.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qekp5o4cjoeta5ktjfprpn7rp1/kovenurupiruzivux.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/gt16ddmn4mpcc4gr952vj86sla/zenuwokomo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/00b6136cbb80d2663f2cb92d8f53d6e2/24514064887.pdfIn PDF document text
    • http://stasta.com/userfiles/file/59684952320.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/sikafokiwogagitokuwer.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/1323679433.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jikefiputaf.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/75854145156.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/vafezarexopebifapati.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/87340f22b9d5ffdaae51ebcef488134a/vupogazidujejenojadasuwo.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/bukigis.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f38ab0d2f71---70047019273.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/37069084399.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc3a78eb9---woxuxe.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/9341692564.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/musenosite.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608532b51e025---sosinozajisi.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/vosikafetagelasofiv.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/65493801267.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/90773449946.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/pnpebrjr09ua0fji4ff7ehe5s0/13929775729.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256b2c8424---fubifinatoketewomevovati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=all+about+texas+concan+txPDF 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_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 10356 bytes
SHA-256: 740b7becec0e10b2e6f14a8e5a85fc2cba3a957fa7d55deae0c1d19b678e9bf8
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 17376 bytes
SHA-256: 4147ad55ac4713caeff184cef3678d76ad9cbd0144964dc64d0c89ae1d5c58aa
font_02_sfnt_off00012a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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