Malicious PDF — malware analysis report

Static analysis result for SHA-256 d645d0962b5f9805…

MALICIOUS

PDF

74.6 KB Created: 2021-09-16 14:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11330ee6851d3019b8542c0d76504808 SHA-1: 5dabe8c6e2b18b331249b10d01e7dc636f4a4aad SHA-256: d645d0962b5f9805eeb49d01ee1be040e48af2feb5ceff1ea0ed20bb17e2a31c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains flagged as compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://clingac.es/d/files/videbus.pdf In PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/52258398476.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/26229930406.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f7c7bdf014f30b3dc233ed72fc6c3288/32384225776.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/40053689778.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/35131139396.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4f9ee28b773fbcb470572f7e79ad8666/76617964384.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/bijesetob.pdfIn PDF document text
    • https://ka-base.no/images_content/file/babevuwotupirezetoderar.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/fagexufirinu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/mosedukigodabalepotolu.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/74588784666.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3750a76424f8c2bc6be8280f03fd7178/finovusabekilowopujubava.pdfIn PDF document text
    • https://cooperspick.com/files/rikerugobipumewekagerebi.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/bobememuniwiroriva.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/womenini.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/folimi.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/39388046859.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/refogiba.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210904130913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=laboratory+management+principles+and+processes+third+edition+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_off0000bc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6B 11276 bytes
SHA-256: 8f8f022f6c84b76182f562c96a12dc2ecf8cc623d2da7c219c437d962711dbe2
font_01_sfnt_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 17780 bytes
SHA-256: c2a642ee027318f458b303297eb76bb08f3273e52c15b49ccd7e61ed772b99ee
font_02_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1