Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bda6679efbcf50e…

MALICIOUS

PDF

94.5 KB Created: 2021-08-16 20:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b908599e7e8d89eebb20c1cc09ba131c SHA-1: 2323af5ab7395a61e57fe1be0b1ff54cd2504f9f SHA-256: 8bda6679efbcf50e1aa1b2d7163ad0ad32bcbd2813a81750f6c6bdedd29d5adc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are either compromised or appear to be disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the primary function of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://dutchfansitenetwork.nl/ckfinder/userfiles/files/68407342348.pdf In PDF document text
    • http://loaamtran.com/files/usersfiles/files/94276766685.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/66323067061.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/wavimenijobip.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/varamogalu.pdfIn PDF document text
    • https://duvanco.be/docs/files/69021627101.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/45251489558.pdfIn PDF document text
    • http://mesterek.net/tmp/52075890235.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8db3ba4b761e1c740cd0ac9e13beb6fc/gujasakemipopiwitodozu.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/2ab6d4666f2aaaebca53a5574329d161/19238220836.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdde2fa48a5---zadavabudalegolam.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c81dfd596625ec31992855c35abab877/94325521303.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/56351623635.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a5f4bc5bc---daxefagubipejoporifi.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/bonotawuluvumu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819a105b9be---85888618102.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c687ae038dd---33399968995.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/datuwarilufomijikivita.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/cabf126de4f41293749a898cce0adf68/zogulapesitilolarez.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/69dbb7868960ba8d4ae64ac38b481138/gakaditopujare.pdfIn PDF document text
    • http://poorclarescork.ie/images/82743303862.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4a76f5cc9dafe284d5b84e3a3a625247/tupererixigapazebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=t%C3%A9cnicas+utilizadas+en+terapia+gestalt+pdfPDF 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_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 17632 bytes
SHA-256: ceb3cf2066e37ad6b2c2250d08e1882dbe19d31b24835ea409003c686b0f9727
font_01_sfnt_off00013864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001507b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507B 10952 bytes
SHA-256: 1bcee4999954fa8aac3a2f7b6224e09e20780e817f156b0508eef7d0f422755b

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