Malicious PDF — malware analysis report

Static analysis result for SHA-256 090e02ec33be853d…

MALICIOUS

PDF

75.6 KB Created: 2021-08-23 09:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83f5e6e79a3443e1532a8c575f1c5154 SHA-1: 399259010fd01e616a2bf71937b3b569e083dd39 SHA-256: 090e02ec33be853dc41357d450748919a4ab07f45e22cb41f54f57d69ddeea04
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable or compromised domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9cm067oo7msqhfp2i0s2u3cueu/tonalerezafizor.pdf In PDF document text
    • http://matsonconstruction.net/userfiles/file/dumajemidaguxaxa.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3c55af28b3b9ea906010bb8a19ac813f/54659839386.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45b6d62a3---50501573551.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/palolekakuj.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/57272891983.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160738a13b4a78---74904543525.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/wabezatopesudawulofafuj.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608518d913243---93650423936.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa7a52a11---31013374075.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/dln36c9681ho0v8q0sdqnhngb6/lamedonugaputojemulozag.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/c4el2hjbbdiu35ebs8ek7e16lq/14639869112.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/ribofetozotavuni.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210803180633.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087809499502---jagavisegegebebaxek.pdfIn PDF document text
    • http://afro-safari.com/upload/files/giwabimejalumuwo.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/71688847139.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/lurupagudoko.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4e60a0f0bf558efb4b775e337c6734b5/xegulelepujewoz.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d4ffa650e31a63483c42f83d8c67ca62/birukofa.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/23a82eb8319d45b53a1a7540e3f72437/71300978846.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/sujozudiresifitug.pdfIn PDF document text
    • http://schubert-hh.de/image/file/savuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+uprPDF 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_off0000c60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 10040 bytes
SHA-256: 3dd4b2accb73ab9d7f95ac62536bb3c9ac1729cf5d072aa93fc69d02a73c2d82
font_02_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 16896 bytes
SHA-256: ec8607cbb92cbc16c6d186d90e82f715f14640e44a5a0f4d0642c6022a50555a

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