Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff90a0a150e42b3…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 16:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e4f73f3d3f51d9c223ac0f1a8bb7421 SHA-1: 0fdafc06d5fcfecbccc8f0aa080efa7893c2efa8 SHA-256: 7ff90a0a150e42b357dd8e4cd8b96239db24c370b3fc1bc1671e16009b3c750c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the true destination. ClamAV and ML classifiers identified this as a phishing or malicious PDF. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lead users to malicious content, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5a480c5fc---budamoxivuxoni.pdf In PDF document text
    • http://thaoduocvn.com/userfiles/image/file/nakuzotomawodubinip.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/jekususi.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/pewudejago.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a021b18c37f851333efd0964b673da30/33041346867.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/16658813257.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/bifuxozunudogunef.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/52873dc35aad77f0e2b7eb76f71c6de3/banetitibajodafavenazidu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e52f2935da31db91c07f847ec8751a64/vesito.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wisusatagiwadamivo.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160725be3b392f---moluketinekevejuje.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/fazeravuvop.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/64ed3580e539fe365bc087a5b56fd732/foxadibe.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/83954023116.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/5174433876.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/jezezixuv.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/semamasowugawalem.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//27394686670.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/biparasitevogaxob.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/24a6ba0b3aec5f9965daa10d56f65772/depunibitodibobigeje.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/rusegorobipeferivowajiv.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/59739753614.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tclhqj3j13etsfovfqj39liag1/97861189860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bryant+plus+90+furnace+manualPDF 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_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 10988 bytes
SHA-256: a8225358ba35ee00ff282c3d9787c3b9467773b10642943d6cb397b0abb09542
font_01_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 18000 bytes
SHA-256: 1aa8f44c91396b3d5781fde42ae76b26cb6b81692fda02680f790599883ee616

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