Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78116f6436dc0c7…

MALICIOUS

PDF

103.1 KB Created: 2021-06-30 20:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec26c3b1e6f0992bbbb8672041c8225b SHA-1: 8dc2d4ebc755a7e62ba2dd1d4ceafdcde16badd5 SHA-256: c78116f6436dc0c79178122fedb55f708dc6c39d3ae3b93e4d3c8aa44d8de78a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d959f9512aeb3840e88ac5c9f4110e10/11157349824.pdf In PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/gukag.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c0f962ecb---47125835610.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d3a8d63c---53999800818.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/97598089811.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074779e20589---kegesenanomijap.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b718e0dbc68---zoralunavozubiton.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/lizubumi.pdfIn PDF document text
    • http://bomtvcloud.com/data/board/file/20210512224633.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/88547041219.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acbd39f7d0---zapemofi.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609534b1c1cbb---zawawaninavagebag.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160868843c5a0f---walaripawivir.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/31439983457.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/sibej.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/63962837897.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/bapodokemafadeniti.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/pugowo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3794385a47---95685245196.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0aeab9df7---sowegu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0284cc60a---14982875920.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ad8945a5---95856367431.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/xuzam.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lcrf34f0hnhdcuiuoobt76ovnu/zoxozapizubokobuligenis.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/vegusuneni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kinect+360+for+windowsPDF 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_off00012b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001434f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434F 18884 bytes
SHA-256: f6c5f6f04d25d53a5f6eebc5b596ced6c52edfe706f63140a49e7a33f1b75f80
font_02_sfnt_off0001749e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1749E 10800 bytes
SHA-256: 6e5609c6fa966957612fbdbaf56b86b2008d87ee25b36cc50efd274d010d52f8

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