Malicious PDF — malware analysis report

Static analysis result for SHA-256 7654cf1d2338f6ba…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 14:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cbcb972651af8a34634225b238da400b SHA-1: 65fc2e3ab0c90b35e9b7d7cc5f7c488424313f88 SHA-256: 7654cf1d2338f6ba3e16ed6da2eff001db4c05d2ac7a29fc25fcda970f98d14a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/45617565127.pdf In PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/9909609648.pdfIn PDF document text
    • http://waterreducer.cn/d/files/kaxanakamosa.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/mirubo.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/69551511753.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/13715696678.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/daba331819a61894f340910b2fde326a/31136907563.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/57146033863.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/36925969567.pdfIn PDF document text
    • http://scro.ru/pic/file/xopinezubovawuzesuwuwixej.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/rafugekiwuvusug.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6da3ae3934---44238012631.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/72835828857.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/46889890910.pdfIn PDF document text
    • http://maidichike.com/upload/files/jojolizeg.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/jarisegusogewirixo.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f5a3d358104ef12e51a077787fbbda63/17903741213.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/ruzitufatugawoti.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ae23788c232d9a796d7489e2bd04cdf0/lovererapajogaxitu.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/85182404163.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d51e9c3aa---48573415479.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/2332398767.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/96798762002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=excel+vba+worksheet+change+specific+cellPDF 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_off0000c931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC931 17368 bytes
SHA-256: 8dd987e581f9b61ce0d3b8a046f3cae3b0b18b8440d8b86744a1c3a248922254
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 11228 bytes
SHA-256: ce2a7b364b9198c0371f0cffc9fcf9478bc0401070a6826e2e74534771bf77f2

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