Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d1e6b71af37755…

MALICIOUS

PDF

68.5 KB Created: 2021-09-08 01:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9cc6996cd5517dc481120c9426bafa4c SHA-1: 5edc88c2095f37ee68a9152280b8b9b1ac026389 SHA-256: 33d1e6b71af377554cdc4adc5b4e2e3be250e4f3c3a0757b20d7eed632324779
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is identified as an image-based lure, typical of phishing campaigns, containing numerous links to external websites. The presence of multiple links hosted on compromised CMS uploads and disposable domains suggests an attempt to distribute malicious content or redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to lure users into clicking potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wheatland1971.com/clients/25033/File/12379948332.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd00f57f09d---widavozokomatone.pdfIn PDF document text
    • http://polletnv.be/uploads/files/30485006006.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1bc2fb8126f83e93fb86591c253f7ac5/81265352589.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/kudovowo.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/27127324155.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/75472013083.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/natova.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/57784373258.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761a25c30c7---dofupetarujajifanenawur.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/340efd4d9a5a0e2724c6233d86c0d709/1494996433.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087e246152ae---wubozu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/563e37b62e423fac5a506ec5064cc423/mobumomupopisutakoleb.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/livujukix.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/sujujurovikineguvubukupa.pdfIn PDF document text
    • https://htchninc.com/d/files/69580816965.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/tojaluvofel.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/41488990706.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/32611770241.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d87730b4610---jegiforumuzoxaturor.pdfIn PDF document text
    • http://licausi.it/userfiles/files/mekipumodeberakojina.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/e3tv36va02i74voiak8nc3fa2q/sazirizojuxigitimusumok.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/45942479008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=double+object+pronouns+in+spanish+worksheetPDF 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_off0000b015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB015 14044 bytes
SHA-256: 62aaf480b17b7bd1b3fe977908fee72aa9188a345cc296e0a9f83383a3e5bcc0
font_01_sfnt_off0000d28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 11020 bytes
SHA-256: b51aaeb69e212930f986e525c8fb8051b928d854e710068665410c9784298158
font_02_sfnt_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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