Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35f077dd35f84b5…

MALICIOUS

PDF

90.4 KB Created: 2021-09-04 01:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e60a38ad25796b6e8aa4c3282c9ddcea SHA-1: 426c110aa5942e359cfacc30347fb412b955d56c SHA-256: c35f077dd35f84b5b623c1a10f27880bbd8f8343245cf050b6675cb1c6646b39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://classicalgardenornaments.com/uplds/file/guxujirobeledefivene.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0549296e3426584518177e81ec2aa18a/wusegizedemefage.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af17bd50b---larivonisabejikapojima.pdfIn PDF document text
    • http://jucal.es/images/file/mirazagimaz.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd1b44995b---givulono.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/savizojepugonuxudew.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/284545777.pdfIn PDF document text
    • http://humanlitech.com/files/files/gikegotoworowileginaw.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf399e09a5f---78869325538.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b44bc5ccb---23010195944.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/77086154196.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1610f2024d0fe9---87960535279.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/kulewutamaf.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/20571318891.pdfIn PDF document text
    • http://brukbet.com/user_images/file/73548063083.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b04ec16b590---74845542314.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c3e6fc2e---53300646945.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c9a6db50---72587641237.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9aa34d8a2---2385569449.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3156bc6f82---71389266529.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/doselofadasila.pdfIn PDF document text
    • http://falerisztika.hu/tmp/13896176881.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/kufedelitodal.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/11b960bfe2caef2ee4f3f6f51ab6c5c1/wapadawa.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/1a5aa91ac45c2e27e74cae5d4cd32e1a/rapodawoza.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e9b81192---46114525960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kerala+tantra+books+pdfPDF 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_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 10624 bytes
SHA-256: f8d5a4d4f6b9733841c09f5b71b81369dee23e6b3e6778246a307ec7e987af19
font_01_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 19972 bytes
SHA-256: 9c8d17edf8904c292417969fe548e22502dbac2311f7ffcb61f0710835bfc605
font_02_sfnt_off00014366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1