Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d23d81abe2a4d9e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 23:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9143e8240296373c28457353059bd410 SHA-1: c0765eda034531ec91c1b0bd6568a80d9498806e SHA-256: 3d23d81abe2a4d9e46976e9d41b75ca80b4cf67e52e655423270396f8223588e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to unknown PDF files hosted on compromised websites, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous links to potentially malicious content is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16107e95892fb0---tirafigubadagesap.pdf In PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kakexosozolidevutuwonavo.pdfIn PDF document text
    • http://brlairport.com/images/file/2004917841.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/48370694365.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/kiwopefijozokutasedak.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/xokewelig.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/74349976665.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e9b1df210---xitamarepikiwosipalonutut.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/felonafagofugefomufimonu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4126a3936f---podidobasilesewa.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/63760144711.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/5ebeca031d487dc08a8c7a0d29182028/22390479177.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/fiwawuviridijusi.pdfIn PDF document text
    • http://standardamulet.com/files/files/13176988893.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d417f2c005f49b2123ff217ed1250aa7/gutarosixilifutova.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/24681823082.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/79185253649.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/pigexetabuvokolamumoke.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/gumunav.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f038a21133---84650127072.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b227af1bf---tikurifebake.pdfIn PDF document text
    • https://avenue102.com/uploads/file/zenapegesewovamag.pdfIn PDF document text
    • http://fbhsclassof70.com/clients/f/f6/f6e65d48c6cf753e26882f86001d336b/File/girimos.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-29/20210729201031266718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nikon+d60+manual+englishPDF 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_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 10956 bytes
SHA-256: da549cf80ef48d443e6cc8cfeac99f85c576f656aa8e8f4097cde91847216c47
font_02_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 18852 bytes
SHA-256: 3fb21ca922aac07b45a4e16d90acaa8cd6e10995451cf24269f2b93992d69f77

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