Malicious PDF — malware analysis report

Static analysis result for SHA-256 28de6345867a596f…

MALICIOUS

PDF

96.2 KB Created: 2021-07-31 21:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6f6e6f7939f2f6cffad8e182c4381030 SHA-1: f4858615cc9531971c50a22f3caf07eaf740d97d SHA-256: 28de6345867a596f16c038f585a8000454d5eecc19f806efc3c92996721faa78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious destinations, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a24923dde---pisadidegurutan.pdf In PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/gelogabifik.pdfIn PDF document text
    • http://arablift.net/userfiles/file/razumemav.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b14379a9a0f---jivilinipanujubero.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8242b479---muzinixitadenoluwubi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5defa7b207---bubimepiwaradagedidebudi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8cfd27f8---xikokexoradot.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/sokadalebapegapudi.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/xujozogafejes.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/96928173700.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/882c05976e6a89f29546817ee0fd5b42/44419779635.pdfIn PDF document text
    • https://telenovella-bg.com/files/tewumegowedunez.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/avitu.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/metosog.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/bagobigozolitatebe.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/el8020f91ummn121q5k72mm0s7/posunuve.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/sufavisuret.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c41527ca7a---53538090455.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/11199339394.pdfIn PDF document text
    • http://novichiha.ru/pic/file/zotowepalobiradino.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82109304393.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/sopazesananuxo.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe3810308eb---bivivexolavaku.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/vavilakiwurerudukip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=entradas+final+copa+del+rey+2020+sevillaPDF 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_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B7 11020 bytes
SHA-256: 9fe7589ab4be301b7f6ef7e14e483f3e52be3648cdc0e7198cbb77c91027bc3c
font_02_sfnt_off00014083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 19668 bytes
SHA-256: c12f167dfc53cb475ca717f97a344bee96f3e71a0d60945b47948a2af13a7225

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