Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f43025531053dc…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 06:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb5eb9426a7c167eb65247b17db9078f SHA-1: 0f95604c00039b83f408d1ba58b80d38f13548a9 SHA-256: b8f43025531053dc70fc5bc6556e532af2b58579c97581c18529743c227b41ba
156 Risk Score

Malware Insights

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

This PDF document contains a link farm, with numerous URLs pointing to compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for potentially malicious purposes. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/xazugerip.pdf In PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/tolitususasigerofakupa.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/0ed78o3jmk7p0fc260ge0t3sl1/18473173094.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/65391940049.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109031245334852.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c475d27c3---duwilitovegakikabemebu.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/juxezilonemidafujakaku.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/potukumer.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/65338746252.pdfIn PDF document text
    • https://ptogel2.com/contents//files/tabogugi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607de1b79d7fc---xorano.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/14744371189.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075982580389---konewifovawomisaduko.pdfIn PDF document text
    • https://masihpt1.com/contents//files/podibu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161064e05bbd9a---82790870649.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/vekafano.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ad05f3e73---nolisufanulowelov.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612501fcf29c5---dewotuzudope.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/jaxupifenexanifokov.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/2151798952.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/rufobefenatavewew.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/88680862799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=abrsm+piano+grade+5+pdfPDF 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_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10952 bytes
SHA-256: 1b5075725600338ef5dac8cf7a9adcfc4f7fd182068cb6b27a5f5b8d890471cc
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 18404 bytes
SHA-256: 22ef70a4e48c8578290923ce7f2034dbd1f4a0ef5afd8057e0f6426a8774f6f7

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