Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a01a8dcd42791b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 10:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 165b92eb5154c2f25dc7fb5d34fa9e5f SHA-1: 32558fa4d5b0717e179c05a7122366624d7065a2 SHA-256: 20a01a8dcd42791b17d9fa12764cd5e7749cb8f74ff680f859686bd9153227e2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to the document's primary function being to host and distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://szalkasszorutacskok.hu/app/webroot/files/content/files/85606404892.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bea78d1f5e5---25050140658.pdfIn PDF document text
    • https://bczenekar.hu/files/file/xitugomu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/372baf29d030878304b2a95de709a1d0/63297096783.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/86249294391.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/sawilif.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e2c6e251e6c567a18d281755252d74d7/xuvumagaredevo.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/gesivedokogaverawatida.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/18825178961.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/16311499303.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/luluxi.pdfIn PDF document text
    • http://thevale.us/userimages/34421872667.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/290348ce23ef4952aacb3d7f16366c62/zuwexodafadigesazirepebu.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/79201185743.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2e56b9f83967cbcd93e44021adc78459/vojawedopapa.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/o35g61sadt14us5qssk7rsl8r2/wofulikilo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/62c8e5a69ea080049f5f8dde6584d77f/nifoxojotewafujawadela.pdfIn PDF document text
    • http://fitviewer.biz/files/file/nubuxatafatawavizatu.pdfIn PDF document text
    • http://gibisch.com/files/files/58485952195.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/zabawoke.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/majunobapizudati.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75271f617---84909919345.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/vomijovojadexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=js+open+pdf+file+in+browserPDF 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_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 18840 bytes
SHA-256: 3f42e45bc875a626c6330d77615b2bb7ca245f49af64229a475415ebaa5900b1
font_01_sfnt_off00010f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 10448 bytes
SHA-256: 234e4d887f2b452f07335b1ce7c54ffbf43bfedbee01e01cd7d2c4591890aebc
font_02_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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