Malicious PDF — malware analysis report

Static analysis result for SHA-256 789c10464391b834…

MALICIOUS

PDF

73.4 KB Created: 2021-09-20 22:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1e69789ffcbc5085118f647e9455b7a9 SHA-1: d5f2989bd32a09d9f1bf3481ea6b66ce8d272375 SHA-256: 789c10464391b834238339ccb691eeedbf094da73fbc56fe8720404a7782cb6a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=dumb+ways+to+die+mod+apk PDF link annotation
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/cb33f14a6af781d31fc9de2df2142aa7/68062009200.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/56063403771.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c2d51815c5c31758d190d2fe8c940589/77471232857.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/wedumotupuva.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/13150920396139bd41806ab.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/75254957539.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pulesepa.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210903_7F11B814CDFF7972.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/bugibos.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vagudabofikewugonewaluniw.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142740879a92---subosomifesivofowa.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/nokizusuxukubikuduz.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/2778911007.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/givetezu.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/39578300113.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/26686998296.pdfIn PDF document text
    • http://cx-gl.hu/images/files/zetanuj.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/lesizubozizikawawujusezu.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/wowelapupefus.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/71332646865.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/30829536250.pdfIn PDF document text
    • http://lukinserv.hu/file/jekateve.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_off0000bdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD2 16376 bytes
SHA-256: c6a6b3c28b74b38b5c242b6f7ef1501105e568c7ac886f961829b7a3e4b11dcf
font_01_sfnt_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 10836 bytes
SHA-256: b7e29240769a6ba92f19499f7981d6a6272bc2d7b6d1addd32e406a76e522d2a

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