Malicious PDF — malware analysis report

Static analysis result for SHA-256 acefd9ae90184557…

MALICIOUS

PDF

102.5 KB Created: 2021-08-14 19:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 38c805101a1a1ab2d5a1f3d15df857ae SHA-1: 650e3ad9b26b976fa3d4e33d9158234556a235ab SHA-256: acefd9ae9018455796feab4774557d8250700292484ab6895863eaab1d212a45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress uploads and other domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://elegune.net/files/galeria/files/30526948236.pdf In PDF document text
    • https://villatoscana-pi.it/userfiles/file/29887321905.pdfIn PDF document text
    • https://peterdegendt.be/file/jivawi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o679bfrk4r64po11slam830510/33554350901.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f117aa6af7a---40030357772.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qb6mqkv967i7m0t7cbdp720e2o/91615668991.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160af9bcde9d60---sapafukamege.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/73ee63e73ece51594971b32c0453a728/39636539029.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e39a4df3---polijasugukekukatoxad.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/29252613443.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/62570872013.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/57582152839.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f7d49918d---vowunusukofiwi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/21uq9huj3vmb6ehbh2667jnek5/73589806294.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/54007905242.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/15015617712.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2424b18ca5f6a145a74e6ddbe72e480e/topagusawolisolir.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/28410476381.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/darufap.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/79041036716.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/5nj5uv16gnguqfbhbhp98sag6g/lifujafepijekomipexemi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56754d88d7---nanamezaxipadil.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/dibobelemozanilapufisavo.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/jesomexorurekizuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=irregular+present+verbs+list+spanishPDF 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_off000115bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BD 10668 bytes
SHA-256: 9dbd641e198d37afa770055211e2a0228e2f94c51ac570b446f079d1c3a18401
font_01_sfnt_off00012dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 18412 bytes
SHA-256: c7c5c7344be3c5a89aa224c10217ddb2fde7b937abeb77da6272b4c732a2b2da
font_02_sfnt_off00015d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D15 16620 bytes
SHA-256: e617bec8a14d90ac714cfd665dcfae10292d0f36f4e10b7377e9a906ce57ab84
font_03_sfnt_off0001739b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1739B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1