Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4f88b7783dada4…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 16:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd994a389a450fd49c03a70191df4205 SHA-1: 1d3cf345f51a4fd5e2238bcf7d7bfa63a1f90c61 SHA-256: de4f88b7783dada4d1b1eea19a695e8a7edb4458db9f2e733499d92038750f6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc7f855ec---rebobemu.pdf In PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/lujevulubu.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/34230706806.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2dcf903d806edd2cb1c0c5bad763672a/livamezapuzakokezabeto.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/retigotesenodatovigenexo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/kfqoc3jjrjkajf7pit5i841u7k/jurujezipaxotogemiruga.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/41006476613.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/31292860682.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210717192938_ye65ys.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b0261416---53397339232.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/60512534763.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/3415848683.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/f9d56edb9849c6cb3f4d0f641fe166e9/89056158760.pdfIn PDF document text
    • http://regcureguide.com/files/files/56348500316.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b609a92583---64949870019.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/98457118920.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/57936239203.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/91555719986.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/42511946313.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160836e45e9da0---5417061789.pdfIn PDF document text
    • http://chinalabware.es/d/files/94081184608.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160831143a8621---58272159163.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/sh7apq9at9rikfe44qevd3kr25/57974582341.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/wipurutakebadorabomupe.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/radosukofam.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/gajigowixafiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nearby+drawing+classesPDF 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_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 17284 bytes
SHA-256: 867bb59aeb61106ce473e4471a083ae10403a0b399df5edd85ceb34146a74245
font_01_sfnt_off000113d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 10644 bytes
SHA-256: 415b0473c7035e5950998a6c7f011d0acc82e7efe4ed9b275b5a61ca4e109a30

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