Malicious PDF — malware analysis report

Static analysis result for SHA-256 a211b58e4bcaec7e…

MALICIOUS

PDF

88.5 KB Created: 2021-07-15 23:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d11e9089d3445b08f590c8a5f2c66f1b SHA-1: d5f36e0686002fc715812b01449c85a1e6914d08 SHA-256: a211b58e4bcaec7e6f906f26a84aa157031d066e11dad55643c1e4538d1aa753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ML classifiers as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's purpose appears to be to exploit users by directing them to these compromised URLs, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=scatterlings+of+africa+meaning PDF link annotation
    • http://clarasonic.com/upload/file/jizulebole.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/51269796399.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4f386311---81990601678.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/7bdcf71bba8831cd3171eba68c35e99b/54377856114.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/moxavuteduw.pdfIn PDF document text
    • https://petikdaun.com/contents//files/relar.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/49b1f9cd76c7e58266a87ffa61b56372/82304251236.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a928917786---wudufedakekonujiw.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/83mv6paua859ll6gh2fjlul671/92361941527.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0baaae408e---6215578724.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b92ab2568b---dijevifigel.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/vpuppfc2c1hn9eponb8ilfj7o6/razozitarikobofejor.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083955d67136---waverisexuvujiseludorif.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/97282116748.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ae4856259844ff2d14d3b7afe025361a/xokukifib.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/mapag.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/pajixerelevixuwijorujo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785a20c31eb---57042565852.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/37259391766.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/17718267286.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/65871546617.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81a5ea165a---bijifazawewux.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_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 10756 bytes
SHA-256: 431f16c71d2811ae0e0afd105f31fced4755d7a621201191b7302d3db83f7fa8
font_02_sfnt_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 17368 bytes
SHA-256: 75134639c7559536b6039b3d7496d6aa191da923a803c6e66bf71649d4924220

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