Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b5d0ba0fc0b47d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 08:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 45f77ff084550220d9979a542ef19b34 SHA-1: 67fa95f38fe31a78212b853ddc77e2b8c94f8392 SHA-256: 91b5d0ba0fc0b47d026ae46ce3dd72d111e5213036f153091c15e0c75e109065
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the idea that the document is a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://mujuerp.com/uploads/ckeditor/files/20210701053755.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c47f978cbcc887f38dc0d9159c31d3c0/tejujepaxozajexiwixinufe.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a2d98c4ba4d74d0bb18e2ee7ed32ea60/20981839141.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/tulawawevowuladubezud.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b5ca6a3c5---jusini.pdfIn PDF document text
    • http://classtool.info/upload/files/fujeliwijixizemesik.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/lolosuxotap.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/75160154442.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/84376955738.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/65936555646.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/fuzunikexogip.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/fexexuwebozubajinuje.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/temarutalivuwadodejato.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/47baf2aef44e505c055fc2b3b813aa15/70189729706.pdfIn PDF document text
    • http://liily.jp/upload/file/20210720092313.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607531ab13592---12500003933.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/gogifodonukavofudaj.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d690046b70---98984445088.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b16dc4551---57156138091.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/fitemoje.pdfIn PDF document text
    • https://dptech.vn/uploads/files/80907268146.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/lojedozepelixetipexuxat.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/28d4620ccdd246042edc6a084b1a6528/nazafun.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb06b3bb6---46891137566.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/bf8vhehoubhljg9lc2cfto7sb0/kolibivivunubi.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/44736965348.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/velanadunap.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/venefikilofuradowosivugaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=discrepancy+letter+nsdl+pdfPDF link annotation
    • 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_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 10608 bytes
SHA-256: f5fa522f3a56370fc23419bc2a103b70c608248a4c1c5db90b05e1be07134713
font_01_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 16976 bytes
SHA-256: 92b68a5c9918bcbcefa520724f7090cdf47d305707d22ccaeb2a39e544546b10
font_02_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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