Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c348ea03c111988…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 05:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9a5a66f29ab78e2bff8bc855008e58f SHA-1: 77c72ce88afe29a39877ed910da86b5d62b3dba9 SHA-256: 9c348ea03c1119883899006fcf95b307fa6252672f287cf9a1895c55b8c72cc2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external resources, several of which point to compromised WordPress upload storage and disposable hosting. One high-severity heuristic indicates a PDF link to an algorithmically-generated URL, suggesting a malicious intent to redirect the user to a secondary payload. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://eptesteplelek.com/uploads/file/masawibi.pdf In PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/gelutemefabawiledonofur.pdfIn PDF document text
    • http://agro-partner.com/Image/files/jazumifitutaxuwebanen.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/51652631428.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/55093884002.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/diwodasuxesujana.pdfIn PDF document text
    • https://bachson.net/upload/file/tisaki.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210909071939.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/rokilubopo.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/lelugokusotisuviwoz.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/1252580828.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c19fc8808---jivetazigejigurov.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/f9mdu6aod41slamlmbdf7olk8n/lasojubalodezuginigodudu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/20e28cfbfe543160daa4e6744c8b7946/16149269049.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/dokinetoxa.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/mijojopotevomuxiliranopez.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/48533737884.pdfIn PDF document text
    • http://www.siposferenc.hu/html/purulomoribubebobewoniba.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/losivexakipod.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/46984628273.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/lipikatisanunuluka.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/rarafowefaroluwe.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/59443453596.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/59626349257.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/tapebit.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/46511784618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hello+scary+teacher+gamePDF 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_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 10584 bytes
SHA-256: c307a27e436c600dd3054e7a840d9d815dc1cfa410dd7aabc1535d42e36e1b91
font_02_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 17488 bytes
SHA-256: 0171443b367fbe24e07ac69f2ec72a210e28b280d2eaae1707c7cb988457a17b

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