Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf49a13484292198…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 02:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7364f95b81be13521652fc4dff5d6782 SHA-1: 7fb507d6d043e773382431f8330e0c53347d6722 SHA-256: cf49a134842921988a566963e202e6970cfe3b76d3ba628f4dc48d8e4938cd85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings suggest the PDF is a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://elosc.com/upFile/file///ITX202109010847356020.pdf In PDF document text
    • http://hiredriver.com/uploads/assets/files/62632600167.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/2697736959.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210803235747.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/podal.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8eede5382fde840abd6bbc68b87c508e/migejulel.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f535cddca9487d2f9c128ab25176aa40/29271560259.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f51fc7bab39---raxuloxudopipimelosadaz.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/20014311665.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/133012f7d10e1c01c32995287711be07/pojiri.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/jalikuronujixalenusenomog.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/48027540832.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e46ec80f8552b460eadf16ce813b5c93/74027788238.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610103f730cc0---tuserofodivofukomagoj.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/91244701792.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2pskb22h4sd2cq5aehtc1qkdr5/fudebulegidekagoz.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ff7c584041631784262f54f080733fc7/22087002697.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4ad52bc9---90354366749.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7001ac05c4fe09b04e10c04a27eba97c/pomuzelikenuwowovujenim.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/000e1785c6b411d67ede25f45bfa77f8/puzidixafifojatipedekako.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/94847360614.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/xokurag.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/futadusiton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=conserver+animations+powerpoint+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_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 10796 bytes
SHA-256: bc8ce0cb38adf3a62ce788a8d4318b6ae2a9390fb7babeca82a684d1a43562da
font_01_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 17856 bytes
SHA-256: f8f5b19c466675a41a4ad4e2f875fded0f19d40baa9d1a779859ccf072fc01cc
font_02_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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