Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d45c44afa56b6d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 06:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 88a7b8fcb3d1ecd07df29f6d9e0efeb0 SHA-1: c3bf7420eecf1535fbf7e54c1c57a15d50979042 SHA-256: f3d45c44afa56b6d233839969581f2f98f11e3c60b51ef19c890dac984871982
164 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, forming a link farm. These links likely serve as lures to trick users into downloading further malicious content, indicated by the 'SE_DOWNLOAD_BUTTON' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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://ctners.com/ckfinder/userfiles/files/95142441067.pdf In PDF document text
    • http://nanoscopy.ru/uploads/files/5882945290.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/wazonururinuvafazasozo.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/lozerugun.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4de96531---sililosawijixepagejav.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/bufagevetarukejiwelefuli.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/20323460125.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/12853820531.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/60785840667.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/xoxulepovobejaduvopasuwaw.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ed8c7041a---7902832044.pdfIn PDF document text
    • http://yejida.com/userfiles/file/21952061465.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/85297861232.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/29420077096.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a8f969c11---batujagume.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130a0abd83f3---27364494465.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/jexijunur.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/73158976529.pdfIn PDF document text
    • https://rubfila.in/files/file/37276942904.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/dopesanerifiwefajirakipi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2090b685f---sipomibime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=leaf+green+randomizer+rom+downloadPDF 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_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 17972 bytes
SHA-256: df30170f0436d3d8a55900c9265528dcc2ece03f1bc7da799a652d8a4ef28477
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 10536 bytes
SHA-256: 11dfbca303a150fd91935d846e4390db1ea082dba94dcec3e8874eaec63a8b27
font_02_sfnt_off00011b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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