Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b203594c3e0374e…

MALICIOUS

PDF

91.8 KB Created: 2021-06-28 20:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 421f5deaf8378e16ae239d082d03381e SHA-1: 9bd26fea3b579d5f4961a3be95f22e51accb0441 SHA-256: 4b203594c3e0374ef6abc0b1c9b7551c811c10de56ba38a87b408b73a3e5ced8
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to obscure the final destination. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://x-site.by/upload/editor/files/tusijakokunatozolotogafo.pdf In PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/15975742220.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1faa9da6---83488161730.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/dlplio3g0hretmknqifu2e94cv/94285863763.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3875f72b1b43f8ae62128180e8159b57/nunepazon.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/81515032120.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/fezekitekopejopagixejul.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b16858cc5e68bf2b9531f27c3ddf2e2/66007967299.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67880977b---gilonepaz.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/12108600610.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/01425d76922fa56dae1333d97a934df6/64584865539.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0eeb67aed9671c85acecfaeeffd634bf/9295884372.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098422f3607b---80147611813.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/77212770919.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/aone9otetv9vogoua3njd5vml8/48725581550.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608243f4dda36---delavuxefoginikuragepego.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/74460077502.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/8877482308.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a3dc56c44cf70bdf5a5ee0ee5a13c494/443904366.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeae16fa63---9159174506.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a5mlos7h0ilesk87p4t5vri5e0/jolurezezifodeloxewegis.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/fozituxi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb38f0a8e---40489098277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+process+of+hydrogenating+oils+to+solid+fats+createsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 17308 bytes
SHA-256: 75f6fdb3f1ce4c529d99f75b418fc50d6b90a381874fe9889ef7870b6499cce0
font_01_sfnt_off00012df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14609 10976 bytes
SHA-256: 351b399277f78ff054a51889d173a11bb6c25318df6b891b18cd73aa3870d80a

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