Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12b187548dde5d4…

MALICIOUS

PDF

88.3 KB Created: 2021-07-24 21:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bc89fba1a9982d1d15f25e8aa9b2624 SHA-1: 318afd8def8a7d1395e74ee32f49049269ef685d SHA-256: c12b187548dde5d444fe2d46b68692500f7749beae54466027b72eb6efaaba27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malicious redirection scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://theemasternetworker.com/ckfinder/userfiles/files/43299896837.pdf In PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/8e954177f8e3b4e7db27dab9317f3dd3/pomujedudom.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/litibopederodadodavujago.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec4084888---ditogemevolipolas.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/jisonovipagukuwele.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/vohgfi4meuegcshemc8i9blnb4/fenewasisufu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc937c60d---tebezomeg.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b33f2abeb44---kavedapugugiti.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6814836d38fede875705b58585822cda/78270487841.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090623827d6a---gogufusuvisokexuwipumog.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098b77657bf3---tapazokesipez.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/gaparafugabem.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/94320855598.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8f1407bca91b523134c8cb0de5f6eb2a/65310943395.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/rapuxoru.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/20087552547.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/59765879869.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b730d49c0cc---77254096102.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5ff49a531663038684642df3cfea65cf/maninegekowipimeja.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105112230.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/tasoneze.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8fqqnvpd2ltrkud3eo2jkd84ti/70962888725.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/kipixufipirixagawamevix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=difference+between+compiler+interpreter+and+assembler+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_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 11008 bytes
SHA-256: b910cbb47e9365760eb0de911eeb6a4ebdd7fa073c645ed6ba130b7de4de25f6
font_02_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 17200 bytes
SHA-256: 5a989bca5f580f07eb77596446444bd4bf64eca4eff25cba74cbb51d09bc300a