Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4becd70d8fab00…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 20:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d16019077907d470d1096380de0453a0 SHA-1: b3f12310286bfa1edb70d6bcc7b873ea9de41cd2 SHA-256: de4becd70d8fab0056191fa1c3123076e401e85fba1ec6e5fa422a2b9c38fb01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of links, many pointing to potentially compromised or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external URIs indicates a strong intent to redirect the user to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://brilspa.ro/userfiles/file///13275897089.pdf In PDF document text
    • http://zulassung4you.de/bilder/file/mivukoxaminunaguritopuj.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/xulatatege.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/gawimizimamilaf.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c2f87e9652380228d4b444e433362ba2/29672181373.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/25619170478.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/dosikodolagomoguleg.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/60613778162.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130194c29cfb---18674696896.pdfIn PDF document text
    • http://mlead.net/images/e/file/deworifazenamubibipuger.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/fagita.pdfIn PDF document text
    • http://vhktn.at/images/content/files/70359249951.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/13989345780.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/robibabudasipun.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/67635410102.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343490ca524---gapil.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133e59323f34---poxabujepi.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210910194638.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/26910863712.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/gutezudunusapodefud.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109030334142048.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/28666863199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=resolution+changer+rootPDF 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_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 18380 bytes
SHA-256: 8ebf522fbe342f2d6d0e05f9842fdd31e01061c976b91013725244c0441b8842
font_01_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 10656 bytes
SHA-256: 6e7bb8a709d3271c5a39c85fa2615a30e3159edbf534271b2d80567e1ee52fd2