Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b588eeef2a2e76e…

MALICIOUS

PDF

84.5 KB Created: 2021-08-19 11:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9931f272d5147217eeffd2f28dee7baf SHA-1: 5fa25038524356bf2907d75dca911dedb6ce0458 SHA-256: 6b588eeef2a2e76e382764d70b1393ad1c3aceaa0c6b0898ecdff33908e50e9c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://amrapalispot.com/userfiles/file/vijufedijosatiruxoxodu.pdf In PDF document text
    • https://die-elke.de/cms/elke_page_files/file/90087745338.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eee268cf1d---53401410042.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/koguxuxezumusat.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/mavowufot.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/l0jl7j7oqdm34lqodjgjcrjp73/suxogawisufivusudafin.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/9361952730.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210530012852127.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/62295519039.pdfIn PDF document text
    • http://blueyee.com/upload/file/150625464768.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/61584569305.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c2a30cd6---44495069162.pdfIn PDF document text
    • http://poiskvod.ru/images/file/5062714712.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/xifivukadesuraxuvutavubi.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/pefilopodutewufevakix.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/sobidixubetijot.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/00e0f3646a94c893ebbbdb7087ef8499/70576675307.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/52076146275.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/88175638340.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/figevobikekaxebawabaz.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5ebbee0880888cb54523ff1796610c9e/telidigosi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v0bocf0k8ucjkecvgfp6mmglf7/nexibuziza.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/gagiso.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/beruxom.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9a2f0f8263b3c77e401c9ef74685a954/pewinag.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/zovupasimumolifaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=simplification+alg%C3%A9brique+des+fonctions+logiques+exercices+corrig%C3%A9sPDF 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_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 17208 bytes
SHA-256: 6c02cc02006401bdd83f0cc8f58c72b7f4b19efdafa23f8a9eb82c5eab666b11
font_02_sfnt_off000124c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 11680 bytes
SHA-256: e55c7f5a5057e3b8ceeede8e1d8040cf0a8e0ce8c5e9c870c731062cf52144f4