Malicious PDF — malware analysis report

Static analysis result for SHA-256 e481577733941452…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 03:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02a65f691e11508cd4dfaabae5641708 SHA-1: 9b70241b75fc42950741bfab28ca86683bd05354 SHA-256: e481577733941452ac7daf9ad040a8902b434eb7e7bea66b58b46294ea7840c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the 'Pdf.Phishing.Trojan' detection indicate a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cathugo-catamarans.de/res/wysiwyg/file/wudavoxakogapa.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613289f16ba69---buzofiwunedazalowesib.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/21414241595.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/mupaxar.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/xojemo.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6137629b8d120.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/wekagekoseximunopes.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417f52cb9ef---58397133203.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/28ho1vbnvbmpd84ojo0lvbuo7n/buvigefojiv.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/lonumor.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/nagajipufasoro.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/ganuf.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/mogazuvojofigunu.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/51988747765.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/47550969063.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614135904afba---dapudiruxalu.pdfIn PDF document text
    • http://zl369.net/userfiles/file/koxatuvolodonojotarojirob.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/liwutiwubikabigixabogamor.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/266898bu7haf0sggqhihelg817/56310421490.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/93104945202.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/fb11ab203345fab6a20f4f1df65622dc.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/2107498796.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210908235501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=english+gospel+songs+lyricsPDF 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_off0000c364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC364 17244 bytes
SHA-256: dc921101f1878403b5611bacfc29a7d9e24a470ab77145806df425a9c1047d4d
font_01_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 10488 bytes
SHA-256: ba2eacf4474b41593157325860cdc53cb716253a2ff2b28d1032e808fd64215a
font_02_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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