Malicious PDF — malware analysis report

Static analysis result for SHA-256 9857ff92049713cf…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 23:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0986f8da95985078e73c6d0764e265f SHA-1: 9a7405e4958217e87f0148f4cd33fe42556d263a SHA-256: 9857ff92049713cf6671c99c0d9358934a00e42e0ff0547600396faed71202b9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16094e042e0b99---tifurezukisevuzefajak.pdf In PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/lc4sii8658ljah1ba3n8tn7432/9918738849.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/74977729075.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/33c10ce8c6fef717e3e1eaf4d50c9e7f/zefavuvatoxufonalozevigaw.pdfIn PDF document text
    • http://airmon.hu/images/files/85389538135.pdfIn PDF document text
    • http://atek-ent.com/upload/file/bukigobuwotuken.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/18703428067.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/9607885465.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/patek.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/64434639011.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/89570229355.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a721cec792---kunixa.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/11160587507.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1af7e6cefdaac329be547ce7798d9829/49183517815.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/86036053039.pdfPDF link annotation
    • https://orangerun.re/photo/files/lisugoxolugawilopibu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d70e0272a34---90391826716.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///guwozevojirekuzilu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/jivavifasenijegip.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/14446355005.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/34174957875.pdfIn PDF document text
    • http://melabo.com/upload/files/43274775225.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/28343379127.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210529_041336.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/xefurilogifuvilakilo.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/relakusojavurol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cube+surface+area+and+volume+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_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 11164 bytes
SHA-256: 40e54d213bf631aa9a1beb03909a5a5f26f6733a89c93adf081536b08a53d9aa
font_02_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 17232 bytes
SHA-256: eee859bf8a2ebcbd9ac42c3bfed046af58b39d5bb13c89e445f004506775913c