Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a89edc559742c3b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 13:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65cebb81a653e2286e08ced0d97abeaa SHA-1: aa3e3fb913632957d720026c47e66995b80d999c SHA-256: 5a89edc559742c3b73cc8e06ffcc9945f051b6fd94cc77f2dc0327ef90a5b671
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of embedded URLs indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=that+was+quick PDF link annotation
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0227bcdca4---11954817274.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d31386518---simapon.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/28319118049.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-18/20210618170248831775.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/lupafegusomedavamiv.pdfIn PDF document text
    • http://bwc.lt/i/butolidubafunu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6ngambar4gkk4hfva7svaaf2v0/jetefijepirizajokuxas.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c35610c512c---78538795955.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f014f8d940c---297695775.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/28826096999.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fae7a7996---mimemopenexavatelininugu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/19dd4281526b6876943b40bb444bba25/wavaginigefoborewilanizin.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/simejovuma.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/ridediperamitulapoziwuba.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/45033451892.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/kbcnfprqbcbgl8evi3g0n71p5o/81377867705.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a8142a682---zibiropa.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/reveniwutabuxakatoj.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/78a063284001211ac2c13c50cce8c575/27586845505.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e8e4e4813b7667b7fbd752cea2e19464/72763619547.pdfIn PDF document text
    • https://soechi.id/userfiles/file/98986358971.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00efaced0f---kikigedixup.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/patakumubajurapimuvewizi.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/55632998847.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/74538956425.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_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 10212 bytes
SHA-256: 5cd274fb1d0d1386f1a3273600936d4505d8567e6ff0d117ac2e85d73687ec51
font_01_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 20444 bytes
SHA-256: 6ee393ec76997b2f0515a42e5dbdf3337785f02e7cd28f4ba6990cf7873a4e9b
font_02_sfnt_off00012148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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