Malicious PDF — malware analysis report

Static analysis result for SHA-256 873f86aab2b999c7…

MALICIOUS

PDF

98.6 KB Created: 2021-09-03 00:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af0723236229a5f0112d9dbf971dfac4 SHA-1: 286f63163f9ee6940ddebfb762f49a0953cb74c1 SHA-256: 873f86aab2b999c7fa6ea4025c571793ecf54e659fd8ea75d114503280212a45
156 Risk Score

Malware Insights

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

This PDF file is identified as a phishing trojan by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users to malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ideviceplus.be/app/webroot/files/userfiles/files/jizelegedekumi.pdf In PDF document text
    • https://stvorki.ru/files/file/kunevovupafizeb.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a001b4d71ac---gujumuniwoxubi.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///5622026626.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a40a41dac---8350616574.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/43136782520.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effd0821be---jikaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932063cf793---70577210844.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/1118959938.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a612f42ef10---bewipewipaxugagazarefoj.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/90360029770.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/72786529873.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/12153067441.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/kafowa.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/54668903979.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/vivazavedijofel.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/76068608039.pdfIn PDF document text
    • https://dm288.rs/slicice/file/2857453922.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddfa7b3933---91529587748.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pasn0v1u7k2m50m1bo0qcadhd2/nurunuxute.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/56dc921b1929e20cb1fcf0d7f4a8255e/6089077519.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/lagafuwudavagoxumixiv.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a36dc33efba37f7d41dc5308c30448cf/jesekemaxozodorinum.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db064d74e---wakivuziwin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=react+tutorial+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_off00011bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CF 10484 bytes
SHA-256: 1af7c56a2b0d7cef55c4bbb96c1d88272c405231f3c621e7a7eea2758f387d8f
font_02_sfnt_off00014bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB8 18700 bytes
SHA-256: 2542f7138139cca64adb0aac265890035204391cb4fa9a97900347c9daf9f50a