Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e8e640645a3277…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 19:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15ad6c4d9c81089015ea47a83dbf5022 SHA-1: 8d837b7d680d975a9cf3081508ccedd07b7f682c SHA-256: 80e8e640645a3277af78952dfb579c4916e79bce53a3544ab42286b1ee31e771
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. Multiple heuristics indicate the presence of numerous external URIs and links pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wolfpackbasketballacademy.com/content_docs/8287978861.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1lsgqdql63t32l5v46im06mgta/luxek.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/8ski97hqsuvhoh08dgmpl6tfcr/58075899912.pdfIn PDF document text
    • http://carbontuning.ru/file/manabib.pdfIn PDF document text
    • http://sinoorchids.com/image/file/jovomofetilaxixu.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/55152987456.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/38727928710.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/zepanikixizeva.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/guxanuserobini.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/woxajasixinetogutuji.pdfIn PDF document text
    • http://learningkey.org/userfiles/65495469739.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/61591681965.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f44e44c053---vevirusakaxabig.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/130535402537.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/rixamiji.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/dinanilupepulupejonosume.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/18278179062.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/japazijukajedogukejavukew.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14350396d---bapowaga.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/wumutifimepefifodif.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/77871298389.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/ferizos.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/ruximuwepajetaju.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/kuririmomebatedop.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/92864774295.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/91918785525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=wps+hack+pcPDF 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_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 9864 bytes
SHA-256: e211674b9e7ad105570375645ba1416b02ba2e9c2bb7a8efbdfee88a8bd68be6
font_02_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 17244 bytes
SHA-256: 0ea7541ac4e326520ceb2c9f8394e004a60812bd456abb42e3611d253b719f50

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