Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aca3e1103f7a883…

MALICIOUS

PDF

94.4 KB Created: 2021-09-02 07:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: abfe6fd0b242b7a297cf330a8698f741 SHA-1: 382b6717283df37089f77df9dd2da33e2408d083 SHA-256: 2aca3e1103f7a883ca6a49ecbfc943a9f6740985bfecb7311b53864ba2ec99e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chinalabware.es/d/files/49967773726.pdf In PDF document text
    • http://www.ecvbrass.ch/user/web/file/wudimiwuzuragijavegido.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/rokibujemasoxuv.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160986ba841b55---11676060599.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/wewovozukawomimizi.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/pikugixobaxigojipob.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/42232353387.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/zafesanenuseganojujudan.pdfIn PDF document text
    • https://digiconelectronics.com/media/tuludevimofaxapu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a583d645100---29070085039.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/tugulejutotonuge.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/gofimezefumuroxixo.pdfIn PDF document text
    • https://basisnomor.com/contents/files/dekax.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/wukenemojedazusu.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216121817558506.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/mitumugirasiferesanopexog.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161238e471f03c---80666890266.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/41326573985.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/76351885042.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/85n6ssjj5hojvkoqd7biv656p8/36501696854.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda7bae2c06---21194057636.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/25a6541630592e67478d066e232aaa49/mivuje.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/xajipikatonu.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/70111674056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sincerely+your+friendPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 18648 bytes
SHA-256: 3dd8def787725eaf6406a966e41521a52844f1280b7b5ced88e9a1b8214fc2a0
font_01_sfnt_off000131c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C6 1972 bytes
SHA-256: b5097d94ac6861a373fc00ebe3b869b74d996f6821ffb5232fc2e2fb2a1a3c7a
font_02_sfnt_off00013ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000152e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E8 10332 bytes
SHA-256: e7d31719d8a4c5d74cf7cd73cb3546511d23d3bd0a4f48d08fad4b6a78a89e3d

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