Malicious PDF — malware analysis report

Static analysis result for SHA-256 039a310d0c9eb32f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 10:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a464ade79ac6a6917c8bd3444af6bf2 SHA-1: 1e06e252108c505d895a5caa561d27779dd61740 SHA-256: 039a310d0c9eb32fe4875795a4c98a551a0be4edb54e83557abde9bff9b723e7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations, suggesting an attempt to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score indicate a malicious intent, likely to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=imo+beta+hack+apk PDF link annotation
    • http://dvif.fr/userfiles/file/nugifuzitonugomigavis.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1614304c60eb0b---dixavoduvubop.pdfPDF link annotation
    • https://gallerylingard.com/uploads/file/77561553325.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/64317861294.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/55c42d0972d84e8fa32116180006aeb7/73747886087.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/lokonogupesawur.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/31186121365.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/takabenig.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f764d35a4e735c812412f77669d94ad/90962386016.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/25094310585.pdfIn PDF document text
    • https://citytrafik.nu/images/file/19676544315.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/feveluzitagimevitaw.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210910191733.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e1c0e64c---wilufotefep.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/34588854617.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/bitufuwexasubakoforofufin.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ro1nmfq1fhn5764kgmq4285kv3/vedulufowegudevukoluvi.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/jepofinuruj.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/nejuromibabodij.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/zukuxojinis.pdfIn PDF document text
    • https://medpressa.ru/files/file/57315731496.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/967453993.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/rojodororopaxuleruzi.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/rokarazagalifenorix.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/61416997441.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/petimuba.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/valizodid.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_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 10312 bytes
SHA-256: cf7c15158929255d888d0406761ec105eb0ea0d6523e38f9fe3b2fb014e02e54
font_01_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 17840 bytes
SHA-256: c4d0ef283d24f44d15f0549184a49332acf2811b02e197c6af5a1fa530da70a8
font_02_sfnt_off000117e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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