Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91c76bcb56a10d8…

MALICIOUS

PDF

88.7 KB Created: 2021-08-10 00:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ecca36a8ce9a5e68c07f05a8a5c619e3 SHA-1: a8adb43638945b2a6f158688aa212ca90166876c SHA-256: f91c76bcb56a10d8e908769b5bafb7f7ebab7b0de7dc0de7000432a953388847
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites, likely to host or distribute malware. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vmkmsz.hu/userfiles/file/duxezopetofekusi.pdf In PDF document text
    • http://austintownfitch1980.com/clients/879833/File/vimanemupuvipej.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/ximusewak.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/75110738753.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a1b10495---93229059536.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/57084586285.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0b7d675b2c8a7bdf8908774585074c31/4121178139.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/6895021048.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/rowubazezumulorizigef.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vhv92d26gbuqdgkb7nrbq65366/lokotemaj.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ae287e501050948a50cfde97658aae93/39957922383.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7v0tqu88k5m65eejkfftdjg010/77275969667.pdfIn PDF document text
    • https://haidangpc.com/contents/files/59286665256.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qn45495fjb9idnjl9jg3oluirc/xavisazodegebitazubiw.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/64398478445.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/50802245695.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/612dc114c39849b6f45fd743ed595cec/79158767756.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a519fa2e62d---sasufu.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/75380655943.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/41fd425ad0830a280850330be97c623b/gatoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e140bb33a5---8984525697.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/605011593.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894455b81e5---32282114114.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/63106402569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=naruto+vs+bleach+mugen+download+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 11236 bytes
SHA-256: 03b8b1b3c281cda947971bda0e832539a31bbb2c50ad05a3b884855468827ef3
font_01_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 16384 bytes
SHA-256: f6e3431b3d13d45829f420cfd7aa892ac76e07a456b12580803bc6bfc48f2428
font_02_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 26656 bytes
SHA-256: c7ee0ddad0873888e1d499330b130ce3b0ccc0b6f9797737dc182a4b70b30f57
font_03_sfnt_off00013cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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