Malicious PDF — malware analysis report

Static analysis result for SHA-256 897f9c7afb8cc90a…

MALICIOUS

PDF

94.0 KB Created: 2021-07-13 19:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f74df08e682f2af6d19d41f0c3afe19d SHA-1: 10af03b939a454b03409cbdab20c71a8a12a5c52 SHA-256: 897f9c7afb8cc90a1979de10ab448a5b0d9bee4cfdbe9197a3ad42b9b8ef46b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a70e8887bc9---xepozomaropuki.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed84da96a---72513245144.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160931a203b63c---faxel.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e164bef52---34792922017.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0e536f6c9fb52e9cc068314f141456d3/zovijek.pdf
    • http://frezerovka.by/images/fxeditor/file/kivijuwumubazunavimoxixa.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/djc86lov6ri0l6ukk9jliijfk6/47240136157.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hm1q733nqdo17osnf2630i98e4/fumevuk.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/39b0448aa62c781e83743de57a50444b/rukebevobotiximomogel.pdf
    • https://wfca-czech.cz/temp/userfiles/files/runewopisivedepipukup.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/vujuj.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ad259d894---41170633593.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160825edfdbb5b---53462426222.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b478a8cf6---32852103668.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6effae4779---namojanozil.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/3cb005ae98a9e9871a5c19d7f8902d63/28982828481.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9751a9fb01---vomubepoxodovixavomi.pdf
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/27084178277.pdf
    • http://meadescafe.com/userfiles/file/18200419256.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feaa5d2e8d---wivurigezujiminasexonipi.pdf
    • https://fnb-concepts.com/images/uploads/files/duxula.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/lusl8ba52u7f8nudd1rvm9nib1/jarixebukituxugemonumol.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608086c363e6e---luminifekojopuxidaxobewo.pdf
    • http://locthanhwindow.com/img_duhoc/files/20626709044.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071da2d1bc7d---20082017946.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90a2832254---39382338183.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+difference+between+a+spreadsheet+and+a+relational+database
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010071.bin
074c3122345f2567af0c4edd09af3a423729563d26aa8286797aa8c71a060f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 1856 bytes
font_01_sfnt_off00010920.bin
133b0c4e45ed15c9140fb8f7a5f478e47ece4ba1f4b00ddb5075068608ad1b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 10936 bytes
font_02_sfnt_off0001223b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1223B 16792 bytes
font_03_sfnt_off00013a4d.bin
1d102da8d3a6eafd685a60c21078a2330831e22cf948b9b1f5e42342fef008e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4D 18384 bytes

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