Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d22686e569ebb6…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 20:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89c93f0f9e5d06c6594d64b7ebd64af2 SHA-1: 5b0240f4939d9d678fec0e61066b29056937acba SHA-256: 73d22686e569ebb6e4a075af1eb911b7ec0ad0bb5e84315b9e5a7099faba7f0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=risks+outweigh+the+benefits+meaning PDF link annotation
    • http://cowmoo.org/ckfinder/userfiles/files/72530039889.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/kukagokob.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/2b293e314812aa448bd2cd3b9c4d302a/kebipataxovutejafe.pdfIn PDF document text
    • http://sns.hu/_user/file/wujabazupute.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/04cf48ed3d46c9b6a087027410229639/kojababajekefaledivasox.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/8uh25i35pdnrkranni91vlg54i/5328959399.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210727192346.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/ledukepivak.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3103bcc2f---xurelurijis.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/34831119770.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/53718423697.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7c81baa92d074693acac5d548212590c/razosuxototewu.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/95010314993.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad37504bda7---watopumatovegiwanapimip.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/43635749700.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gimarurowopasekavenadezu.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/boboronunofif.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c380842968---wupedikomanekiluw.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/xezinagetid.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/67254790258.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/xememux.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/18513451512.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/87645057352.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160845fb68a219---fifipimab.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/vozixijiwapumebubuwe.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_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 10980 bytes
SHA-256: 28435537ef233822126f0b471e4e0daf4f7e9d99ddf40baa64171df55b78805f
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 19876 bytes
SHA-256: a8882c20c827227e9c7eaf446444e54e8d76593328f3f7508148d5edbae963c9

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