Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fd4ceae70610cf…

MALICIOUS

PDF

99.3 KB Created: 2021-07-21 23:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e556b475ddf6e7cc6ca8b58bb16ca64 SHA-1: d4db299898b2942e319bc7b22595d0c749978081 SHA-256: d3fd4ceae70610cf82756b4e56ec678eecc4b0d5f84e166c0baccb5e81865925
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination.

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://daindnc.com/fckeditor/userfiles/file/55952944639.pdf In PDF document text
    • http://gyobel.itpublic/file/vipafeposelip.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/28846719298.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/57d250decd95337fdaf677a0b0b4228e/sikonafuw.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/76543197901.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/678c33f84e0d88cc29c062bcbfd5418d/vaxemibozuzonobodil.pdfIn PDF document text
    • https://eurocomm-italia.com/file/romunudemaj.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/pesiwenarifogum.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb46022c30---17017762580.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda1b89af85---lofodazuzidefezavekew.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/90617789902.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/56457041974.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/34915976922.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/95ece7d72862b59efa23a41ee4e23fa6/15163409602.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vgbcvgvckqli94jj35b2k36hd2/84592220336.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/39560535595.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160719e10667b3---38233409837.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4f0b035fccffb0f1301e8a90cbdf1e2d/2268588399.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/65131406158.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/bixig.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f88300a25---vojumaluwiketuwoz.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/90196807668.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/2do9acpcof3b7tn70mpfg58tei/mukosojikumodimu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160821de58608c---jamiridezatigiriluse.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/72233902598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=red+mark+on+baby+eyelidPDF 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_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001392b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392B 16992 bytes
SHA-256: ba185618b321de26cc28ff497e82a9baca998c184c2440a2ddcec72d84a7fefe
font_02_sfnt_off0001653c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1653C 10532 bytes
SHA-256: 4e413c0acd50bf3c99c3be6101f9aba3b234d8a2d935d0bdfc11cdeb103f228a