Malicious PDF — malware analysis report

Static analysis result for SHA-256 197497b90b62e25b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 10:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db39dddd2e92aaa2d82170bab83e04b1 SHA-1: f0226ab811c1cc3abf71b104c083327fcde0e4c9 SHA-256: 197497b90b62e25b8ace2f260ea9ffed6b1932a706521a806df50adae3e307bf
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier strongly indicated maliciousness, and the structure suggests the PDF is designed to lure users to external malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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 http://duszek-lasu.pl/userfiles/file/6711832728.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16114e0682694e---pivesomukokuruxizu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094850d3802e---fajedukupesifixiwejad.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f02fc4987b---faganafejifitulif.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9e23e1dbc3f0bfb00011b779dc745ce2/fodiponozupoxuzerejijuwit.pdfIn PDF document text
    • https://soechi.com/userfiles/file/ziwutupelagilavovewobof.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/bumaf.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae708db6ab3a597e0aadde3cf2d29813/worulatunejiwitixu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1ab353bb75486391116e23f4aa2d924b/riratosedokor.pdfIn PDF document text
    • http://cycling-software.com/files/file/lexepupezujolisipeje.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/gapigajajisixerudibumu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5057fde792dedab18a456ca822b0a54c/88565474475.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e3171bc6ebb9e689f85abe36eed894be/57167481471.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/saxosi.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/68597760160f9c3234e23b.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b582c924a21904040030736d83a9923d/ginawu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d2e395c1f---51942625856.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607280818cb3c---77700874263.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nelegadukizonabigop.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/jitisexunitogokutobanowu.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/givexabipirukowis.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/2174558298.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/janowovopifu.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/19688434357.pdfIn PDF document text
    • https://vestol.bg/files/file/37553726884.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc9ab13631---55767320247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cogent+midstream+pdfPDF 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_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 10828 bytes
SHA-256: 09c39c73c67e3a515cd44c575dcaa11e102777d4821ddd4224daca7c41264c23
font_01_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 17544 bytes
SHA-256: 08edcf85745d8ddece1a96ab2c33224787cd3691bebbc8ca0bea9f77759c9a44
font_02_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1