Malicious PDF — malware analysis report

Static analysis result for SHA-256 9382c0b7d7c29956…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 22:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82062aad2003d755aa67dd594a58fc54 SHA-1: 793c84a3964bd84ae2ac09cc27796a14c2bc3514 SHA-256: 9382c0b7d7c2995694a5de9e3110ae750b1f6a86ccb17451fa00431dad51f3e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=weather+widget+no+ads PDF link annotation
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b1go1ilq53c2j2eph3vlti42j1/liwas.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/milapoxomum.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109110610142967.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/sovedikewosanorivisu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3c7h2tmcveh55flcd9fnbkauu3/fadajumixoxilokesiboli.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613f15b51da44---vepovezolulipuj.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/79409111105.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/59815735901.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8fd39gmh7ltco98uun2i1oaef8/65261481659.pdfIn PDF document text
    • http://asqcert.net/files/files/70767074572.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/75406531182.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/90002966379.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/9355334316.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feee4edb5e---rusozutinopuvizijiwu.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/36645601178.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614177f63c1fc---xebutarafiwavuta.pdfIn PDF document text
    • http://jsdarvin.com/files/jerivovokitikaxivisavopax.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/dazesudozegujirat.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/26564229985.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/32851309799.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b71d6e4ac6---47887173765.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/fimiwebava.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/pekasexevagowapigezadowiw.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/11570160881.pdfIn PDF document text
    • 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_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 16872 bytes
SHA-256: 11140c8c129ce985fa61826429e79570ef4ffdda65e82bfa946d7fa9c145cd54
font_02_sfnt_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 10560 bytes
SHA-256: 13ecdb3fa3f1c78497f6743a481825fdec30ff5b3dd58d25aafadef4a35c3ea9

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