Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23f04a33329c84e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 12:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46c848f833fb203bc7cb4492b36b4888 SHA-1: 1ed1e8442dea2bfcefcd22833ea5aed6f82a1f66 SHA-256: d23f04a33329c84ea35fd9bb4df6021162e31172156c0a2e394775f4d575d1ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm or redirection mechanism to deliver malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://astefin.ro/ckfinder/userfiles/files/kudogekuvupinu.pdf In PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/vesevixerujakubadanavulip.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/17104342837.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/gajupa.pdfIn PDF document text
    • http://labonscafe.com/userfiles/zukokol.pdfIn PDF document text
    • http://flexa.cz/docs/file/6154804621.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/sugiladetekape.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310196a79f4---88363154450.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/mojibixuvujedevinumuxa.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/bigixeniwobegomo.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/32363709281.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/50614972879.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3b1afe60ae471b92b67c23217ce15d00/ketebaladadejenovobobo.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/nivirugixogofono.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/77834574801.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/30372020100.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/53739243582.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130e36df00f7---jitakesopuzem.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/xebogoxojowapomizebos.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/19851079426.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/20674722171.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/64678330393.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/31625797356.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/73375132889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=9mm+pistol+technical+data+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_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 18184 bytes
SHA-256: 0600c7aaeb0652335e18211c72ce730c94742dfe52d15ab872b5f08c7f780cc0
font_01_sfnt_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 10856 bytes
SHA-256: 3aa68da86dac48b492e39a5bb8c5e0c260b3ccf38a6d955958a8ce5947e8812d

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