Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bba55a545f5ded7…

MALICIOUS

PDF

87.9 KB Created: 2021-06-25 19:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbc7fed985f64a09c79d6189294cb599 SHA-1: bb04e0d56db38da915d16166808255d0010375e4 SHA-256: 6bba55a545f5ded7824c395898bac7d9f37c38629256f002fcb5ac9f461b18c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the ML classifier output further support a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=scanning+and+repairing+c+drive+stuck
    • https://alkalacarservice.com/public_html/userfiles/file/fokebopimev.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/7uul722qh0bivqt08h2600pqr3/wibukasi.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb4439738---19771048868.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/i4s2r67e1kum36b6ug1irss26t/toguranimile.pdf
    • http://jarosi.hu/files/file/zejuvevenidusojup.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/95583792492.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9a6f5d9bd9c63982a8545a3a18686c93/roravimorukinawisivo.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bc1027e10---tajetivome.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f81e690b---18654927973.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/guzunijuwifosodubapopap.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb084b2501d---dituzujogidadiz.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1df016d5893b1d5266d0775d1e92439b/32529596006.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6ee6d0e35126c816e8d133d1ac56c16b/3823138337.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d3df3e5a---tufujozakurudaramunavagoz.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afa77200887---wadoto.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609896cd13161---21253251023.pdf
    • http://abwjefferson.com/uploads/files/taxesobubopizarepojuwariz.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/cb1082b94a52cc42077de9702d883b78/88878951437.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/74923386888.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0975769390---xivofatififesuv.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/57d83c73b4684735bba0c18d84340333/gaminemugugulite.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d4ik45tjpq3flg6u547p147fl3/bibefikumatofeketuzukeri.pdf
    • https://menu2uplus.com/images/file/35298161808.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/8a800e1f79269b80c0a18edbe7bfb6f0/juwojejiv.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608260250aac7---suxineruf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e0.bin
cd71a6e88c7526769dac0e2ac96dad964fe3ed267d6bd351e525e8e49e29d43d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 17492 bytes
font_01_sfnt_off000120e4.bin
f553757d54ee4a4026a6a8425d2471faf81a571c8eb6a58d5338fa2c0f0581b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120E4 10856 bytes
font_02_sfnt_off000139f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139F4 16792 bytes

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