Malicious PDF — malware analysis report

Static analysis result for SHA-256 16463fd113862bec…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 11:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d269109cf38359bd5a148db9f243ac4 SHA-1: 7d1f326bf34812fcfe6552743d6e44eb4c1b15b6 SHA-256: 16463fd113862bece87648d2b7f3287d291b3c455a4f98147b731cbd6e19cb15
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick the user into believing they need to provide a password for an archive, which is a common tactic to conceal malware from initial scanning. The document also contains numerous links to compromised WordPress sites and other potentially disposable hosting, likely serving as download locations for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bced5ee1d7b4ddcbd1b6e034e7c0462e/rejulatiguxajela.pdf In PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb2b394a6---guxixo.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/bupekuzutun.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831e2797270---jagor.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/kodulopesedav.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/738d757460eeb7f3891855990ae8a736/xotegoxiresejuledopuxina.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6eb824d300608fd9f64ea1ce47d06fdf/gufuziju.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6d1a9c51---31134100910.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/mizikewanoxaka.pdfIn PDF document text
    • https://rotitelor.com/contents//files/bomakanopakemegefepas.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f81b8fd9517d51699c1b200624c4eeb5/62772906196.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e1e6f5a6---13929375335.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/89007962032.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/mesenuzidejejimajezukoda.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/88740322939.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160710c11ba96b---57721417474.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/369400a83f69fe9272872deaf0f2551b/5198715342.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161196c033a08e---89913171680.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/birokabugirujojofezaw.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d83ec746a8---fonatijiroxezarugojesu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa8555f60d---64664618436.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/sumekodakejurepawijokevi.pdfIn PDF document text
    • http://patroha.hu/file/mufopobezalabutavu.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/texoruzonibifutanojumupus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+compress+pages+in+pdfPDF 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_off0000cbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC6 10996 bytes
SHA-256: 2381419cc77d58e6e628fae31196a372090527bef3d15c84e7fe8d3a2b57115e
font_01_sfnt_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 17900 bytes
SHA-256: aa4a47bf060cda3b398cd8ebbae7cb60983201491ef99de2b794ce54ce0697cc

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