Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0d61c1b7b4ad81…

MALICIOUS

PDF

88.9 KB Created: 2021-06-30 15:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fa9a20c444095ad32a27b1805e07938 SHA-1: f32a00d86de911aeb684c3b696af106edf96d894 SHA-256: ff0d61c1b7b4ad8103ab778acfc87b8042256b9bac98f3e7548c60ba46efc7b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware downloads, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://aps-mes.com/files/file/33677039077.pdf In PDF document text
    • https://hotellemaritime.com/hotel/upload/files/deluxi.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210530_D1FB8F1ECCC420CE.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0158a985e54900c083e9761c6c59ca55/74893438509.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160756c8336c4d---liroguxotezubeluletare.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94c85e1f2c---38948359689.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/nekudegozozevoko.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f190e98e9f---ropisegajojijit.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090afb84f58d---29145479389.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/bokivadu.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b5231307e838d2232024fc207c8f64c2/74976815871.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2uepb43s4mbk52okporpqlrn51/22891892743.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160732c2d439cb---99210426203.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/rakatepotipese.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jalediz.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514161715_1357605771.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/8499827616.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/49087848036.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/95942273185.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/d0199f1d8130fb6ee8bb0c7147f72e64/tadijoretixawinibifavi.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/sulepujejabedisejexasadux.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b926cedfc---vikemujekodigibumiruga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=build+muscle+lose+fat+workout+plan+femalePDF 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_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 11112 bytes
SHA-256: 4cd800796cd28e6bae35687996e70f5b8dd63193f9b091eb5da0cef251f813e8
font_02_sfnt_off00012ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE8 16732 bytes
SHA-256: 2513e1ac06275bc556d7bf4c43831a396f14921ed4aabfcf7cdaf40a29331fc8

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