Malicious PDF — malware analysis report

Static analysis result for SHA-256 c731e04b1fa887cd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 07:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d24dda8aee6afac79d7ac75abdf0a42 SHA-1: faf8a9f691f410a6c41e6d8a383ec641e1b6d76a SHA-256: c731e04b1fa887cda1fb7f52a56935fce2a640f0505f23b7ee0b4496f9b4e9f8
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some of which are hosted on compromised CMS platforms, and includes a deceptive download button lure. The presence of these elements suggests the file is designed to trick users into downloading malicious content or visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=flipboard+apk+download PDF link annotation
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/vudif.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378b3b85dac---giwitukerorara.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/xuvuraboro.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/tuvavot.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/39134004374.pdfIn PDF document text
    • http://www.siposferenc.hu/html/valowinajivex.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210904_66D34024E33ED15D.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/kixudenaginilijex.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/56447857856.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vabevusugewesakin.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/35724426413.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109061635573617.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/9966610467.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/nafakufobabimewutimeroki.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/fiburutejin.pdfIn PDF document text
    • https://olterus.com/contents/files/duwepufezugeworapav.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423ec969c12---ramejitit.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/lutetubanatof.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/52224389962.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/lebusanotesodisimitewowe.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/15564529293.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2b8f515868b52a7f4020c650d066b51c/fojif.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/pagawavuzo.pdfIn PDF document text
    • 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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 10284 bytes
SHA-256: ba1b55a7db7d68d0436a709688d77faca731711013c09e19ebcd29963c7ad128
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 18556 bytes
SHA-256: 4d0de8ae8132bb05bfafc21d06c7b347e66e051594b28b43c1c210b316ab06cd
font_02_sfnt_off00012663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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