Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b33cf035df18a1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 02:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 116c41a30e2cb48053c119fd77e0f49b SHA-1: 2b45abae33168baf8e28599671dc933ec4e84b46 SHA-256: 44b33cf035df18a17271f803a99066cece05358931300f55cccbaa2312ab7802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a98a2f12f---budogigodokoxopaz.pdf In PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/juwuxakepa.pdfIn PDF document text
    • http://com123.vn/uploads/file/ferakibanufegoru.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/75418383495.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ktks8i42595umj5easirvlh1tl/48675889888.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/78783399650.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/lebusazakatimu.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/tikomajadokuzak.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/35333601102.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0609e4b4f1---xusunuvegebeg.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608753ced2e63---putevibi.pdfIn PDF document text
    • https://actor-conseil.com/files/file/robexasitefure.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b86cd4b7f07---pudufoj.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/10635556630.pdfIn PDF document text
    • http://kleiberit.ru/files/file/nesana.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/q73q0qtrtvgm5uil1uf5gn6qlb/27620193363.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/53676518715.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d4f6d4aa77f23f1ff4e9fff430299f26/75332536265.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd2cec9972---zonegodesasowivubil.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nusobosafosigudusif.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/14309465552.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/tugamekopumixegowufawu.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/puwamajera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fuji+x100f+manual+focusPDF 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_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 18608 bytes
SHA-256: c60aac49116f62704116d85bace298d4f7a604e1c0095aa2e7df3bf6c791e9ea
font_01_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 10648 bytes
SHA-256: ef4deac8eabc9950f2adbaaf37d0bbb4d05e68eefcdb97990634b5676cc3072f

Open this report in the interactive analyzer, or submit your own file for analysis.