Malicious PDF — malware analysis report

Static analysis result for SHA-256 40be9ec7cea42990…

MALICIOUS

PDF

86.3 KB Created: 2021-10-11 20:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 40efa37d9eb420b534ad9bc20f83c328 SHA-1: 20426eeeb2b2e66003202eb06d9ae0c55b9bc089 SHA-256: 40be9ec7cea42990a271ad3f010395451a7a6a0bf157db91e77bffa114849a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malware or host phishing content. While no scripts were directly extracted, the nature of the embedded URLs and the 'link farm' heuristics indicate a likely attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.web-globus.de/ckfinder/userfiles/files/5420776872.pdf In PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/60468097364.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/jebugelalizaxam.pdfIn PDF document text
    • http://surestegc.org/documentos/file/62384901812.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143ca339d4c7---medozijad.pdfIn PDF document text
    • http://ban-mat-canh-kinh.theonejsc.com/userfiles/file/reluludegete.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/zafilobejafetad.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/sabep.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16156792c08c84---4700490024.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/kigusitobidilej.pdfIn PDF document text
    • http://imaginove.eu/data/Files/2011505234.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/66563324929.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16152fc3065bf2---soziz.pdfIn PDF document text
    • https://swiz.eu/files/editor/89101362624.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbe3a9280c---49010102737.pdfIn PDF document text
    • http://unsersohn.ch/images/file/28226107344.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/71068187695.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210930/file/16330001142485.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/51706286594.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/kakarevotodatedugaximeg.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/wedamuxajaraxineno.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/livigipenal.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/powut.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/nemedivivinof.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=neil+armstrong+landed+on+the+moon+onPDF 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_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 10672 bytes
SHA-256: 2ca640d3ff95073a175dd6cbdb95bfdc8e8458a60df95147e879195dd7a942f0
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 19380 bytes
SHA-256: 68bc2a4bca1fc42df728f2cf79d3089dac4863e1ccaebd9e350b004c20e0493e

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