Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadcdae11af9d84c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 23:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48d85455b61dde4d151767f760b479e4 SHA-1: c2db2a6924b5cd2b57f08119b7260f806322dca5 SHA-256: aadcdae11af9d84c8ef4be469e8b1ef0baadc789855d8076aa833e41e30c866c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to potentially compromised websites and link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=pixel+gun+3d+unlimited+everything PDF link annotation
    • http://niezapominajkowo.eu/userfiles/file/969227422.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413ee175952---81382102462.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613586bb2c937---59940888562.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/rizeridedojawijizamemunu.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/konavopajuliwimugezupoji.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/37036563412.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/kexorewanigosixenidet.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135799248f54---bodasatow.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/25570275303.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109100017204637.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614273c5ce69c---dutivala.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/xomopixakawune.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/12756372321.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/11926905036.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/30026515019.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f96037d0f5---96324421782.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613143d08b04c---fupasevanepatijopogofad.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/86602472545.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/74850315285.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/67770872443.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/rowukulebe.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/mafapatinez.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16142551064d1b---46672895432.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/livilanavozet.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_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 10800 bytes
SHA-256: 54e78de2daf29a15b3b358b65892c4c108087fd0f867cba6b86593c09d8b7fa3
font_01_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 18068 bytes
SHA-256: 1825c7b3d30c6eefa3b34ee20228948a902a6c1f084afbdfdad26ec386b4564d

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