Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbe9edf4dca9f05…

MALICIOUS

PDF

80.5 KB Created: 2021-06-26 02:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fad29f832d88200dafca9d5363083fb1 SHA-1: bbd139ad891075356cdf3123e31756c0df51d705 SHA-256: 1bbe9edf4dca9f0513fc96b7f943497b27e22613d47b2b2d58f426592c18526b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary URL, https://inwebjor.ru/uplcv, is likely part of a redirection chain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://inwebjor.ru/uplcv?utm_term=primary+maths+challenge+november+2008+answers PDF link annotation
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46e09262f---28637275654.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19dc8d9641---puguresazasewilok.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/reieppi5pmir4kjg492csrpbtu/duzofi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1c15c160832f3ba530602a041f69f56d/45687943696.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9b57031f---muwegojowejev.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8088371dddbc08f9cb7e98ae326446e8/43076288370.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/regufijasezirulade.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/gujusigiketalog.pdfIn PDF document text
    • http://iccarrentals.com/files/file/rinojixelesibakoxinepo.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/roraxuvowaja.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/73290370308.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160940386cc337---93321610160.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c7b55a2ad9b4e01f385ea66c295372af/92374898198.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/26596866556.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/70623889860.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f68c4b74---9129981972.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/vipavu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/8ea968m3ch286nkmdscji4u704/wodog.pdfIn PDF document text
    • http://aa-nusd.jp/sezokumafenilikezutero.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c2b5b174---nigesikozamoparuw.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kenadaxapemo.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/salifibupanuzuwonemo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/6292357060.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 17212 bytes
SHA-256: 2856eff1434f7a6e976235feee248f63cd1579ff9f7051fc3d3004891935e2ae
font_01_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 11532 bytes
SHA-256: 7b0d8f5ed6fd8777aad1656bad27e7121d9345cea5a8ccb52bb5a7937a0aa3a6

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