Malicious PDF — malware analysis report

Static analysis result for SHA-256 7add08b33eeaa53f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 15:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73d19394acf73d4793b7e8284688557f SHA-1: 0f07e7e7ffade07b31fe60e258226380f4e59826 SHA-256: 7add08b33eeaa53fab2ec6054c3c8f3f7ff949cd1ed932d4ac6c407cee401414
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM further supports this, indicating the PDF's primary function is to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=fortnite+save+the+world+redeem+code+ps4+2021 PDF link annotation
    • https://retrofitoman.com/ckfinder/userfiles/files/91436997934.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f2ca03734499d7cfc5ef355abe04759f/81607160558.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/eo1jqr19kirhcqai7ltgtk7u86/politidewamarufotoxetugaw.pdfIn PDF document text
    • https://bawauang.com/contents/files/xoputukurupiwu.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/setupixegugobe.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/vuvonan.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/8931793754.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/39112469967.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/16297777984.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138e1e56d903---sowixewasatufa.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/72860542470.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/19381696817.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/pakewotugavadakibafaxanev.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/59973668751.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/nitesisukanefulim.pdfIn PDF document text
    • http://odumakus.com/uploads/files/20873413042.pdfIn PDF document text
    • https://krossi.ru/images/content/files/joxunekimawafu.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/42827618340.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/88611554149.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/41766665397.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/56165542188.pdfIn PDF document text
    • http://ingore.cn/upload/files/demazejopiterivazi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0aa47561---lemitu.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/lizewilamavu.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_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 11280 bytes
SHA-256: 04eac1183ff0ea20b0aea687b2896a2630472129bc610fd61995279f5a4e0194
font_01_sfnt_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 18428 bytes
SHA-256: a15258c82d89a84b1b83e05de1d7a8aa087ce774aa2ff36f872345d41319d486
font_02_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1