Malicious PDF — malware analysis report

Static analysis result for SHA-256 023876b0d5071cc4…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 08:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b04a0cb0c8d16151c45b19a99f8b8b6 SHA-1: 59fc40e0485164f3b26d546b859db13e24af41a4 SHA-256: 023876b0d5071cc46fc5099cf48b68439140e943766130e6fc44b3045cd0ec1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=real+cricket+20+3.2+mod+apk PDF link annotation
    • http://daejonggyoyc.com/userfiles/file/20210901170131.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/labuduxosed.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/25396450197.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/60761657691.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/tibobelixivajakudok.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/13169117110.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae72eb08c7---nijasesexakepefurenav.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/93654507102.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/8589006492.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/20892343544.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/nolusosexur.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/fenekot.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/vojibogaduj.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7eu3qdeldeh192aucifi1ku5jn/muliluxadaletavole.pdfIn PDF document text
    • http://falerisztika.hu/tmp/nolaxul.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/54770506004.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/jixuxisugi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/452e90ef8008d5f73c6bc0f7b4dfdaa3/4140753826.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/lefasajasukurewutezowopa.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/didepoluwevazefokugi.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/92380480210.pdfIn PDF document text
    • http://newcityhk.com/userfiles/bavobolike.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138def8ee70c---38499141482.pdfIn PDF document text
    • 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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 11020 bytes
SHA-256: 1a0e366c0d89d6f27826b57974805ca8626c96ef960cdb05fa51784fa6ac2712
font_01_sfnt_off0000fc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 17268 bytes
SHA-256: 4b46f3143964663df639674283af1de8ec67f14c94506d558a0d793a78053735
font_02_sfnt_off00012941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1