Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a5cc55f9ea40ad…

MALICIOUS

PDF

110.4 KB Created: 2021-09-03 23:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2aef0e9761f8b7a4b70e52bc5d5d39db SHA-1: faba3e4be91e4b8e3a7c0bf348e39aa987f948a4 SHA-256: d5a5cc55f9ea40ada624cbd66540bfbe18a6a933e5688f2dd1d3e7ac9fe891b6
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it's designed to lure users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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 https://weborder.cloud/userfiles/file///27214926421.pdf In PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/17de87792ca143275fbb5e55f7f85962/70972351299.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/bowoz.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/458318dfaf5c75525957393dcaadb0b2/49399523666.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf93ecbc2---tiragawoxef.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5c4gtpe5qbcq7hgnnurkiof4et/96282013247.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/86891938617.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/voxaneme.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/89538337320.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d64c4953adfb8c3b0bab22b553e402d8/14434640001.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/08552ba18a0f1dd561aadb8c4bcdd945/77878635095.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161240fcd623f5---87020250404.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/61941912861.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/xuzodixofelowededesipugoz.pdfIn PDF document text
    • https://bloc-immo.com/images/51514192747.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/37841166055.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/45163612786.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa74d3293cf---tolusufebevijumupe.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6e5956fd6---dajunidebezotifudonugaguj.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/46222185015.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/df09301e910ecd8a155bb39a664e356a/bapaboserase.pdfIn PDF document text
    • http://maxbrio.kr/files/files/deradibixikazowimivek.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/64276735407.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tci6euc5buppu7rk90mvj2ni33/82022014693.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/pemale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+wolves+play+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e8a400f52---10810118704.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_off00014948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14948 10428 bytes
SHA-256: 5b4fed913c6180c713a3961a454d04717d40bfe3abcaf34d0402ac602c79dd84
font_01_sfnt_off0001612f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1612F 19216 bytes
SHA-256: 4e9370a31cdba956165aa8a3796687961bb73347a230e6533ece01ba1b760165
font_02_sfnt_off0001939d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1939D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1