Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad723653b791480…

MALICIOUS

PDF

76.8 KB Created: 2021-09-15 03:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d06d7b885002386f345a65c3b36ac0f SHA-1: 53e03b83cae7d90c7d151eaba823268976e08338 SHA-256: 9ad723653b7914806684512b937d1492fe8e89870bf9dac1e9cb871da84cbaf0
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=uc+browser+premium+apk PDF link annotation
    • https://hoatuoi360.vn/uploads/files/3326052676.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/16426185764.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/99017588756.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/suwizujawavoganobokol.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/77500205915.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75deb5fc8---navujonobovo.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b90a1eb78b5fb93dece9a0edba28c37f/19474280733.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/zamimowapikorisisuwopomag.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/10794654751.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68420440263.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/51232026801.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/62308847009.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/59517268817.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8s1uieeheq9tpmdaustvrvf873/66071373197.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ktet52f26vh6emvoeo44jsbc6s/61600337652.pdfIn PDF document text
    • https://miet.hu/kepek/nusiwurotagojixiwiwe.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161413ce918501---64170479885.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kopojiwotexatusesapo.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/52582679330.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/48bad8048f12a69fb46df8537407dcdb/81906537810.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/deparamigimogaxunetib.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137086855895---72514557047.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/tejimifiwojupuxugiwamano.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/lurakipunixotonazibi.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_off0000c47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47B 18468 bytes
SHA-256: 1a04959760297f26be3950213426535f2dd2fdaefda00d0ea61b413a244616ef
font_01_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 10712 bytes
SHA-256: bafca9adb4901954b11e943065c2568e6d920f85f4abf07cae13125e121ae9df

Open this report in the interactive analyzer, or submit your own file for analysis.