Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fe4c756f56734f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-15 23:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f1abd13a178742f9a7cf5db1573b057 SHA-1: 6f655a5ad8947f42398bb5e8dde6cd2b469a7a65 SHA-256: 64fe4c756f56734fb9659c86cc4c7c2a0c6bf585635f9f19085579beb2909187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137843b1675c---21973928034.pdf In PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/31716035826.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/93084242583.pdfIn PDF document text
    • http://gdgom.com/upload/file/210914092118132131vrhr7skupp19.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/jaxakanigasunafevixera.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/xegifuzuributomaposur.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/57845304318.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mobanonusitex.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/pixevebaxo.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/36447819258.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/raralawojeturuxis.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/54774254534.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/83890578984.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd3247d95---30691106451.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/61914166238.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/23634323245.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/50368788900.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/73900443096.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/notatudemifabuz.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/zixibuxuseje.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dijijitep.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6b693b7f5c381b48bbdea3fc6d953f5/49284842268.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/4046587794.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/jugutetonibibanipuv.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/xukezejemadenunogakun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+secret+codes+apk+for+sportybetPDF 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_off0000b90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90A 15608 bytes
SHA-256: 996a9820bf19fce80cd2c59ba7b69b52765822f868f480d6d9cc30d83a4f9f03
font_01_sfnt_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 10896 bytes
SHA-256: 9ed49ff3de3ee0f45863f00760f0a5b024f859276091c9a3c7bd62937f112752
font_02_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1