Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11aea90e56fb6c0…

MALICIOUS

PDF

97.7 KB Created: 2021-07-29 22:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd796753821078006634f63103e26179 SHA-1: 9dac6657b60991132fec6cc65542c8c55c5b871d SHA-256: f11aea90e56fb6c0a776a600ac79c2c798271543b70dac938292431a575798d7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload storage, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161004d9874163---39609545744.pdf In PDF document text
    • http://fotografieindex.nl/images/uploads/91219028583.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085217d45ae0---xawumubini.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098b75a659a3---42041255521.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/wamobakegafawipivesaluj.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/bolodozupomalapidatenaxen.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/75439128661.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768d069e299---63249585325.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16072665ce00e9---36735354441.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8a35a465---13690078602.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/faribiwipofapabedudaki.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76ea0bce8f---33238085605.pdfIn PDF document text
    • http://healingpawswisconsin.org/clients/a/a9/a991db820639e3552774ed9a746c1e3b/File/ralefunekidexowatafanugo.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a20268c7---40458193863.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/xapowidojuxe.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/4959c90d20194c76d1daa9a0fa812b22/15371260060.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/239b57e1df19762b8f003871d8212f5d/95660646547.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/71860232437.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/kolixesagolipolowodejul.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/zegosunuridogasebuleza.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/i1n1vjl01ubq4n63bh1uslqok2/molerugovunivanolutome.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/tazozokobugiguz.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/17386972473.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/tulutoti.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160940731ed23c---zizival.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/97791860914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ley+de+newton+accion+y+reaccion+experimentosPDF 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_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 18660 bytes
SHA-256: 7c1256908dd3c3ce6957c75218722620533b3e21ac8d22174ebeaee0a301ecfe
font_01_sfnt_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D57 10888 bytes
SHA-256: 88872e24632b704f481573b795d748bdaa3197488a597e4d0c0db94df62f45d8