Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e18b39b6ffca127…

MALICIOUS

PDF

75.1 KB Created: 2021-10-06 00:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9ed289f2476209fad096307dbd8be669 SHA-1: 0d3ae542dffbf862408216f248335fca5de0bf62 SHA-256: 1e18b39b6ffca127969b41f9ed1c5eba71722c1594b06b764d0cbf98e558d008
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document's structure and URL patterns are consistent with a malicious PDF used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://stringladies.cz/userfiles/madajozuwonedifizigak.pdf In PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/lusawuluredevasiz.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/zujoxifus.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/99609527759.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/gowinilo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147e7e0485e9---60583274653.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/57768056418.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109030831217804.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/18518112830.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/67clshqbke4qnf4ug0iftibarc/8070987632.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/60271272223.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/69844451670.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/tezodiwejalaval.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/19304820599.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/87832609356.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161599affb274f---29681180057.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/letikilat.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/bufopabinetamalosutudo.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161485a98234a8---vovolutajibotenoviluti.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/10682948421.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/8945906489.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naderatidezeba.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/19004996836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=substring+in+awkPDF 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_off0000bcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 18908 bytes
SHA-256: 73929831c1d98c14da6f333928096f985143b2a2fb61d0fee59e40924c75110d
font_02_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 10480 bytes
SHA-256: 98484bc643ad5e228b6d177ffb5b4807ac27d612a3e6006e225e1a94a935b8a1