Malicious PDF — malware analysis report

Static analysis result for SHA-256 019e31f95a9bf16b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-23 21:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f572ad0982625a2582f1d574ac7e16c8 SHA-1: 029d869d4d95c9bc879371db2ead8736beafd543 SHA-256: 019e31f95a9bf16b889dbb233acbfe98c6bf05ddc3bb581ffd12a2ecbc9a9b43
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security checks. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting suggest an attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bartonsteel.com/tony/barton/ckfinder/userfiles/files/lokedevegokunokuw.pdf In PDF document text
    • https://tauthuy.vn/upload/files/89015389926.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/89558073399.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/15497982625.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/81656225558.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/60075018253.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/53203089349.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/44520219250.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf208e0f7---85387791922.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161474dda22b0c---52711724874.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/sumisotuzetilego.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/tuwokuzubu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd4bb92c69---jusabewojexikiwebusatez.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/34433468997.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/dozibinebugugorigekaxob.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/diwuxomudenofefem.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/wobivawogexuzix.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/68474614531.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/bubenedozaludaneduvuvivol.pdfIn PDF document text
    • https://theipbuzz.com/images/file/17431331247.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210905124354_tslog3.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377e5b1c64e---nuravokedax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=prince+of+persia+warrior+within+download+for+windows+10PDF 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_off0000c241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC241 10980 bytes
SHA-256: 463e2a8a3d1227c6767fdd73d8f0215d598121a736b7f2f58f55e835fc006707
font_01_sfnt_off0000dbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBD 17616 bytes
SHA-256: 85c29ea132d69d55123f6af456b60688c8d06be5eb5c526e7a39b2f90e6817f0
font_02_sfnt_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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