Malicious PDF — malware analysis report

Static analysis result for SHA-256 87774559c1ab4f53…

MALICIOUS

PDF

95.4 KB Created: 2021-09-17 07:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47ce3aa490e1b872ee8d354a289959f1 SHA-1: 36527d994408a8dd12db24cabb1110a1cf391fa6 SHA-256: 87774559c1ab4f53c12ffe8e343fb5b4fa13eb30d6c068d3e151662b7c520721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://equinox-e.com/upload/files/fumumofasizelitoz.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141924288415---13796376.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613612f46155f---zinuzotijusen.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/49493248312.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/48644529389.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/fajuvumas.pdfIn PDF document text
    • https://codecs.ro/images/file/21869910816.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/muzejowimu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161398ce25b385---62055477787.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/7432110824.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/sawamodu.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/dunewojubejuwifobavaxivi.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/55936524256.pdfIn PDF document text
    • http://husplaza.hu/editor_up/fusub.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///93003637509.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/142021782613e86b5c5194.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lujodadet.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/kevuzi.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/fenenolimabojevivog.pdfIn PDF document text
    • http://1carl.com/userfiles/file/wowonagofi.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/vasika.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/tipuvidaduwapejeluvuk.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/mexov.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/kotikusivetamotesel.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/livum.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/nuwapamurutukume.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/9342070567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=copy+text+on+screen+androidPDF 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_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 19488 bytes
SHA-256: 7e9fd77ef75ddcf218588c543320316f9dc7e0a083faf6dd31ab232464688ddc
font_01_sfnt_off00013ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E2 10708 bytes
SHA-256: 7940d3fff296e633255980d6fc5296180816f14c83929d9123f3e0893bcfe0cb

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