Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e628c2b17124605…

MALICIOUS

PDF

92.4 KB Created: 2021-08-12 14:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9710350c6c99fa624cc3d8d32507a6a0 SHA-1: a34e26ba462e6ff75e0f4721a0b670f461bee581 SHA-256: 2e628c2b171246054bf6848231f3eb07d4ffa6c8dd3843cd6b173080fc4cc925
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised CMS uploads. The presence of a visual download button lure further supports a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://nomylo.ru/uplcv?utm_term=gta+vice+city+cheat+codes+free+download+now+pc+game PDF link annotation
    • http://dlikefulproductions.com/clients/875850/File/96686213515.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92966b596a---80666143154.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/kanasamomukin.pdfIn PDF document text
    • http://immopolignano.lu/images/84026783704.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/suzotatisitilusi.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072639808971---7396534039.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/08b2de08eddd8510566a90dce3fde74f/zilidaxisijolinovolaj.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160863a987906e---20233131351.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708180571bd---70041607312.pdfIn PDF document text
    • https://adikketiga.com/contents//files/lipepumalilufem.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/99598417215.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/mvf2q5u1u17kqrtev3ppo25vtf/11118421450.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ae9e5ee3a2f6b034ae9bd79cfc009b5c/solujemugapijawonabivuwip.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/mevosuzilexizidos.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/tidakitilo.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/pogetulatuteroled.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bea15db42ea---14062557114.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/22410771596.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/wibarirozixupumotiseb.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbad775693d---61472472386.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd8c84b96---deduwomubixij.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/xaxikudokibeziki.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/63n3j6gqdf9sbfn3psrge9q3i0/82588921833.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4b2cfeef176015dbdca96289ad7c880/litovosewedo.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/bunumitetapobipezewosi.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/39452567055.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_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 17588 bytes
SHA-256: 977f62be2b3ddfe6505edaad6dd40b795ac25935751488e4df649ff1c5d0be54
font_02_sfnt_off000148a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A6 11372 bytes
SHA-256: 092669bbb11e4e9a4e668119bcd7f2a998d81095d5049f0e3408640c39ff562f

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