Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac49f39f622c094…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 08:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82b4a563f3b9ba6a4ebf3cde609f0e78 SHA-1: 198f9ff7f70de8718a4136331a342fd3330c66ba SHA-256: dac49f39f622c0943b77f2a1a305f42895611347500478d34617ef4e61c6a143
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common phishing tactic by presenting itself as an image-based lure, indicated by the PDF_IMAGE_LURE heuristic. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, as suggested by PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://maturana.cl/upload/file/suvijexosozowakodazugewi.pdf In PDF document text
    • https://bodzlomu.com/userfiles/file/64467028323.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/tevatalasarogomi.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/33330590633.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135f53f8ddb3---38588126202.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/sufudowu.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/17367980236.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/vevataxonele.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/levulalelotonitidinedani.pdfIn PDF document text
    • http://savemaxint.com/files/file/77102906556.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/pukusemeraxakivi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146311ef136a---79586706962.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/85238811868.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/52740683555.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/41991638003.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/wuzoritewazanabiwozozaw.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/kiletezib.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/wevanomojuwibe.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/varakodutamanar.pdfIn PDF document text
    • http://pb-book.com/user_file/file/55986106329.pdfIn PDF document text
    • http://tianfonmm.com/d/files/karixusazabex.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161513a5eef5ef---12042174789.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/nuwox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=jumanji+1+streaming+vfPDF 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_off0000ae31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE31 14348 bytes
SHA-256: 8da3c87dc032190feb22e2621bd8c67279dd3c7f4ab5f87ed6dc5aa12f8cc5f4
font_01_sfnt_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 10728 bytes
SHA-256: 36fe00672f0bbdb5b77a9bf2076b98e5a01ffe5af76bf263ec86b6b83c75267d

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