Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3dfb3c153e4d32…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 12:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8325558c60f5caf547c8dd089484f692 SHA-1: 2f7dbf5d0b713bcc96be474776dfca4dbecfdd1b SHA-256: 9f3dfb3c153e4d322e4dbbb1e1d14a1dbd0245270574f85e202edbb8c29de8a6
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 detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infrive.ru/uplcv?utm_term=sony+six+watch+online PDF link annotation
    • http://igabana.com/upfolder/e/files/20210911201758.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/roxujaloni.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/62984610981.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e14a70ed5f---wafisubege.pdfIn PDF document text
    • http://zaiger.ru/img/file/55575739488.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6478df4e---99487953245.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lij1uae69is89ch97tmkjfmq3b/dukelasolusodiguguwedesa.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/miviten.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/ranavisokudubuwifu.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/83253345729.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/napurerebikusalesemepob.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/sopigekurobifun.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe541a91b8---43762253402.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/71897346525.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/xifewokuzajakiketovuxotu.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/sijosopakininelasi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/73f26072f42789cc5096c726eb15c999/fopig.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/41672560587.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/8604567598.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-4/20210904192327197008.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/difiwikejopodivuvivuk.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/tafukovobip.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/magotulogob.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210918021029.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/31483504718.pdfIn PDF document text
    • 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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 18460 bytes
SHA-256: d8c8fc38b7adcb48581fd9220b5030fa8fa6cf177ec4962727a8904a933b319f
font_01_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 10604 bytes
SHA-256: 5b95dfccfe3935686e3d8500a7918e76de3a6a84b1e2448cf2988ce0c9a7f824
font_02_sfnt_off00012572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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