Malicious PDF — malware analysis report

Static analysis result for SHA-256 142ae61fe604791a…

MALICIOUS

PDF

90.6 KB Created: 2021-09-05 08:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5c8887635c48206e86b5c7c6ca378153 SHA-1: b5a1baf22987459ef81227cb87cd855f14c10713 SHA-256: 142ae61fe604791a0d4d76666db563bfd9cd2da4c2ea8f6f03c069f97914c5b7
192 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The document also features numerous links to potentially compromised websites and a visual download button, suggesting an attempt to trick the user into downloading a second-stage payload or visiting a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://myexamadvisor.com/fck_uploads/files/10655487860.pdf In PDF document text
    • https://ht-cooling-j3t.com/contents//files/42599864513.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202152852723.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/15827654338.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41644d917---7611396070.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7cmfuomrm6ncpa1jm9r5m1be40/69742973385.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/jofewajirikavezar.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/14816159622.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/65656981863.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23af0fb4c---jixixo.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/tasivu.pdfIn PDF document text
    • http://kisito.com/userfiles/file/89976049755.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/limukesiwozefenunukeze.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/869734883759d792f4620abd4d6c9d6a/bemojusimujusar.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/49429145533.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/89574574089.pdfIn PDF document text
    • http://huefpdf.org/upload/file/19525407704.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/83399371178.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/11e49a46ddc581657ad8eefe05b0d71a/tiwebedopak.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/421qqp88sa3k2jnkkb5fburqqr/71746089445.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/temizezites.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5c45197f5a9dbe1edcf1ede23e4515d0/90622980165.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021822143169916.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/15540858891.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/70951070447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=jahangirnagar+university+e+unit+question+bank+pdf+downloadPDF 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_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 11512 bytes
SHA-256: d0608b8615b3087b8392515d95d7eec035890f2ead44a9321a642648f8dc9df0
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 21280 bytes
SHA-256: d28ea38bb7691a12a2cf8122bcebb224700971fcd6a4945a1014790af2746771
font_02_sfnt_off00014218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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