Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e47f004a1cb5df…

MALICIOUS

PDF

88.6 KB Created: 2021-07-04 20:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0dec4ec754f07c144edd2bed0e64ae7a SHA-1: bcc305a34e8c3e131af80a53b497ac2e02f4a694 SHA-256: b1e47f004a1cb5dfddf1c12391132abf816db4c6392a5abb1791a07273af1186
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for users to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c22bcb6001d43f47eb38c18c55b2e41c/26015360996.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/pusovowarezawotigasusa.pdfIn PDF document text
    • https://aashianarealty.com/file/fudipexuwewarip.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/makodetovexamaxakakazat.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/76420466971.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/421659cab975d10794ed35751b13b191/nigafemogilozisi.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/11856236463.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dccdf0f1d---nalolititipikas.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab7a8bf5f---bapana.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/79688229737.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/44887294147.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/nuponalikenijo.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/a36fc64899c629fa11da2c3ffbf7019e/39994767648.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962722ede7d---55461811844.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ff5681b54---81199870707.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c29b392c---71683551549.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/49a42c93b5207819c3b1be4b3324eb0e/44636152527.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f2565fa6f4677ad1da0c836fbcd227d9/20335199451.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd77f0fe81---fisepabamiwopo.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/skd8vd7eurv0d7o3pg1sib0ujv/kurekeruzoxapililesirato.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/5kh6s84jnvgi4vtjppb4h1tm11/toduboxejeminilu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aad8f4cd6bc---8750993918.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160941eb6ceb92---6919329341.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e435e62e3---98620457584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=first+month+of+winterPDF link annotation
    • 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_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 10336 bytes
SHA-256: 8cc3f3286827855d4c9d61d4d5d1d2fb1b68e5d8ad5c0618894c3523b76343d4
font_01_sfnt_off00010ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC4 17284 bytes
SHA-256: cd296af9e66420f336712da3dd6f7ca4937f7cfef3800bea9e8f9ed058b69cae
font_02_sfnt_off00013bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1