Malicious PDF — malware analysis report

Static analysis result for SHA-256 9612b9dd923785f9…

MALICIOUS

PDF

95.9 KB Created: 2021-09-15 22:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd7c7bf573d011d070f12c5807704233 SHA-1: a85a95bd6870c588c756a5026bf6dedd6d7c1604 SHA-256: 9612b9dd923785f964c4248a5fb7b1a30eb487d2641a4ae1dbd16c67496ffd41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://allytemp.ru/uplcv?utm_term=brooklyn+nine+nine+season+6+episode+1+online PDF link annotation
    • http://artc-polymers.com/upload/images/files/taneku.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/211444435.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/xobaxetijosilukadomub.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/nekozebeminiw.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109050817484285.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137e58aea6b8---kuzipiwerum.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/binefokik.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/70340378798.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/xunuromasi.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/17530048896.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/gijuribufodudi.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/rakebenoxomoxibali.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/sinubatego.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/56478723463.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/32434498078.pdfIn PDF document text
    • https://udruga-invalida.hr/files/20154387827.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d75d0668---tovawuneg.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/ramabobagejotej.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0fc0c9be---tupafebifufawuxiveb.pdfIn PDF document text
    • https://ka-base.no/images_students/files/kuzodidexepuwog.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/lufaputofi.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/50650144780.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419349a25e2---worafupubaronezo.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/73146384326.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/mafebosomonukevegeza.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/fowodanuzoxefu.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_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 10764 bytes
SHA-256: 28dc7a3adda4df1e21846c8491f98f642fdd82ea58be103f22233f953c80a6ae
font_01_sfnt_off00012a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 18328 bytes
SHA-256: 8d39774e578e9fa20893cdc71ce9a8a501e1c9b78d08cb4ebb6892fd82198dea
font_02_sfnt_off000159a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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