Malicious PDF — malware analysis report

Static analysis result for SHA-256 481a624f24b84730…

MALICIOUS

PDF

93.7 KB Created: 2021-10-08 22:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5900bab23f8d221c5f990f460d298681 SHA-1: a667b8a36b4691427d217cce411230628e6e25cc SHA-256: 481a624f24b84730a796f17ca2b9fd398393fc20f40d213e56e018fa0b3cd825
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, some of which are hosted on WordPress upload directories. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=intercede+meaning+bible PDF link annotation
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/uto3gl63k02rb06ff2sq035dcg/23852336689.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/61866145351.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/gubewutuvotajexasabuv.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/58609138890.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/wisabuwinanewozukidogumag.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/22651169332.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/94626829826.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/66486157122.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161582072abbc4---samipamadina.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/kujoxikugujifotozinilo.pdfIn PDF document text
    • https://mimpishio.com/contents/files/91507525707.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/92002716726.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/xadutapero.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/57137454871.pdfIn PDF document text
    • http://veitali.com/upload/files/42953487939.pdfIn PDF document text
    • https://yodobashi-church.com/62464760051.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/sugetodozasonerorojol.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16142ee9324a17---45091744640.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/fexumifimomexo.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/95004985561.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/biked.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/68471458391.pdfIn PDF document text
    • 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_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 10516 bytes
SHA-256: ca4ec450e9c9af1d1571d53096840493ffba65c8f87c011aca59ee3f9406d35a
font_01_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 20392 bytes
SHA-256: a29f5656418c1b6b4c44cd6ff31a8ec904a01b8dd62c8a4ced7ced7d0cac0051