Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bf9424ccf5f067…

MALICIOUS

PDF

88.5 KB Created: 2021-07-07 16:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb00211174c84a0c8fb725fabadee881 SHA-1: d2357245b81397da151ee8524b63af8e26c74340 SHA-256: a7bf9424ccf5f067c68ecadca2cc417f6f35eb69928c7f68e14c78898831d2ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm intended to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://angelojrobles.com/admin_initial_test/userfiles/file/fajenifilikedemezopef.pdf In PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/38351176404.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/gje6460v6g77qof4fkbehn43jc/xokodumunopokedu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608db6480ac83---93155462973.pdfIn PDF document text
    • http://sam-global.info/files/file/71431603617.pdfIn PDF document text
    • https://irantruck.ir/data/file/toberiveledut.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3189c6079b---kasiguseju.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/xesutagixanazija.pdfIn PDF document text
    • https://memoservicesrl.it/file/mutomevevebezaxugupa.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/28613329643.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a3790e379---pikelawanipirugud.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073028b6c7f1---41849621286.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/62259343471.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25e6571657---vineroxinizin.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/dirudaje.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/4757330969.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pixisofekaxajinipuxafowo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/54180845079.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de569bceb18---76029139128.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7a2492d9---87499580448.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16246321341432194305.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084223177da6---19783728653.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af85fc8b4d4---gizotupuzopu.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/66029588301.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/4d668408eaa15352dc0ac0b6cdc677d7/kuzukexizareladubave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pan+card+for+foreign+nationalPDF 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_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 17348 bytes
SHA-256: 5584e782e464fa5ddadebef9806faf5391630adb0d46949732a87c62c4159d41
font_01_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 10484 bytes
SHA-256: e8a1aeab28836e431117f41d2ca3b3bff18180638718e49eac7416531c578641
font_02_sfnt_off00013cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1