Malicious PDF — malware analysis report

Static analysis result for SHA-256 1342cf6ccee64876…

MALICIOUS

PDF

88.0 KB Created: 2021-09-16 12:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b4649309e205a81a6af5009af561fbd3 SHA-1: d4776389aa563b40a1922302423fa873ced712c3 SHA-256: 1342cf6ccee64876601bfdb29250887a5b5ee86a6fdb80fc1d89f0f5abde151c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the URLs and the overall detection suggest the PDF is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://oniceh.ru/uplcv?utm_term=virtual+q10+apk PDF link annotation
    • http://landonintergroup.com/ckfinder/userfiles/files/9689130986.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/nakutobinamixezejowo.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3e32b1ae---nazitasu.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/nerezoba.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/33179926826.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/50330558807.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/bemugolizupamokiretux.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/12768765634.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/14476054165.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/tekedug.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/vowitadarosogijulakamep.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/71282646185.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/tabojusoduranenokab.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/pewisujufajuvijetarovena.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/14856061561.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/domoresufuzarosi.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/24560839252.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161340cc424aac---25580754255.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/69c180728ae08761c59e14da45e70dd8/zuribezuwe.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_627C2588D2CA96FD.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/74301268634.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613840912166c---lomegiso.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/59371226471.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 10204 bytes
SHA-256: 69f0d15fd65e646df5cf3b49409ef7bba8beec29ea2b3b51251cd0cf2e735317
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 17072 bytes
SHA-256: e818989edf03f333fc4d9c0464985ffb40d7ce9a78d5f37ebf016cf1ecc13ac3
font_02_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 18248 bytes
SHA-256: d283dc685c426c252877ae88a4636a050942b2e7ea43448792938b9461092ade
font_03_sfnt_off00013a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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