Malicious PDF — malware analysis report

Static analysis result for SHA-256 94df6cabce3e5a35…

MALICIOUS

PDF

95.9 KB Created: 2021-07-30 22:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a7e2a51f26de9eba5190c4010ba9940 SHA-1: e1dbc23fdb2312ed82f66fb315ba1d4da32686fe SHA-256: 94df6cabce3e5a352ca4ed53414b6068f3706eb84a42bcca7589b1cd7cb2b469
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, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of multiple external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607084f9de692---83637939094.pdf In PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92103863150.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/votaretoxolitagatug.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/xabalutowuge.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/01e4a0d3ea20a0cff6b3640c60593d49/sazite.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/33939858354.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f81e9d70dc930cd52fe6a788ec4424bb/21324669248.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce7774bcff---80425814159.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/d8968998585ee81a16dcb91f64d37e3a/54967998523.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/pepateluvumiloga.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/nafafuvatuwosetamavetubup.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072349ce22ad---71417988800.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/variw.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/sakulirogoruxotokifivid.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/40389442333.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/xogesixabufinuxeroluwuj.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/3393271149.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/9e50a06c3d593496f75fbd151b772f6b/79949974769.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/26022209848.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/30489241807.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/zopemodupovisokoge.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/72577250662.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/jijokefuboxutip.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c86651146---ramifalipos.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/garolonidodimet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pacman+frogs+care+sheetPDF 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_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 10644 bytes
SHA-256: b38a0e96bd5742fb5e339442eb19a48d4707881cb3fb86bdb980c765dd64df87
font_02_sfnt_off000143ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EA 17828 bytes
SHA-256: 8999ddb13fa9902c418562b6164c379a170dfa6bc42dbe152570179a9a9b72e8

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