Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c9fa731d9c86a0…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 13:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 827ac634e6fe5eec2d58a9985e15ba75 SHA-1: 272a8ab06e27cdd2dc4a655cb32bc90fe618202d SHA-256: 81c9fa731d9c86a06d5595d7158c58c90f296f0d0e56a8a665444a1b9432b2f9
204 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'password-protected archive lure' heuristic indicates the document likely instructs the user to decrypt a subsequent payload, a common tactic for evading security gateways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=manual+setup+gmail+on+android PDF link annotation
    • https://soalmatematik.com/userfiles/file/69781408509.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/ganodiridoxodapibaxaxo.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/banulutivememuvefod.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9981161457.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/96124250690.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/52617351061.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/99646260140.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161386710b1182---91830656177.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/88809502860.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/56289780727.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f54c058bf---kavazonoziligudutaxomusaj.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/99825114937.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/lipoluxi.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/1381088970.pdfIn PDF document text
    • https://ottopianos.nl/files/gavumowexotezik.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/sodof.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/kipigofa.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133eef6c5a1e---58433883662.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/25937060127.pdfIn PDF document text
    • http://eternaseguros.net/files/files/poleduvilanemirisumak.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/79704918497.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecdd2bcec3---mudixed.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_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 18320 bytes
SHA-256: b77e80a160f78dd3a70b36d23658a0b77afb37898ea49d4bcf7fd54c4535f806
font_02_sfnt_off00012d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D64 10828 bytes
SHA-256: 641ae38d5bcff9daee9878467bcfd0b90dd6a03454eed8b39bdda62100ecf930

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