Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c68c759958359e…

MALICIOUS

PDF

97.8 KB Created: 2021-06-29 01:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 36e529c9a3d9b35edb5a9132459a1000 SHA-1: 908a3b782e3b6c086d0325438a19466d928d5326 SHA-256: 89c68c759958359e14c65bff7c1e9e8a4d8f7c9007194ca9a5ad2ddc48364b3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://drafthe.ru/uplcv?utm_term=hyphenate+in+a+sentence PDF link annotation
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c301fd83b6cd9319eac625ed488389f9/90049203585.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/54856739940.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2bmera32sjcb05vf291hdlm778/gulomisukur.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/wutimidurexufefajuvo.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/49720081269.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3987aa00d---xetilosumega.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce722c55b---19209923725.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/33ec9edb32c46d8fe8cd16ed56bdb998/13100584821.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/78afe93ba83190b625e24d6b37e854d3/61537195001.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/03f3786f2e1f19b83673892d4ae6f01e/39984200329.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608240df23d21---tipigunatosar.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/vil1uubnsrsv0d622h62ajuq91/87113568844.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7824f9d31b---zefufeponukupipazizonevan.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d4b68d2b2---lisugilubevazisod.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/7515177461.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/58095058777.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077058405f32---xanotipawonedudaresosegog.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/jpmm3us1upt357707kvd3e6370/zimom.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jo66fcs32hormbm5na000faqrl/27832278341.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afd49c260f8---sosobesitadi.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/guwelokat.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160722b941bcd1---lagoguzalagiduloje.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1e3df072889f8e1411e19f3300d1299f/43487465666.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b5b95e059780276f36dfe1bc56383fda/73592770074.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000118d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x118D1 17876 bytes
SHA-256: d51afd2e60aa666927a2e9f11b0a5a155b4400afd33ea253695cfbcc36ed88af
font_00_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F2 10308 bytes
SHA-256: a2bea96faf27b508e52db27607a69d0fb630c98cbda82445108a9a2281b71198
font_03_sfnt_off00014c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C21 17452 bytes
SHA-256: 2bef8c10f68eafa0b5e47a85a8bf12fb8761104bc5b0e28306b1fd7384140588

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