Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f4a4f7da2de23b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 15:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d6aa0a52ec211095d0d45a9142767dfb SHA-1: e4f90b7fa7f0ed7bf7e3752fd37cb6c903fa7aa7 SHA-256: 92f4a4f7da2de23baba2b36a3b3b8456983ff2253d3106cc94184fd27b1833c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and numerous external links point towards a lure to a malicious site, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://woodbridgeabw.com/uploads/files/witaviladagej.pdf In PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/lozesa.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v3dpkrnc0mad9vdlaunfrnt541/19748156007.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/82238807422.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a365370ddab---32061171300.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/nuparanakadixisezagakux.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/76887779359.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e9cmhbfd4r44of6v12kv9kqhrq/52169260338.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/93475955690.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160943005a8ff4---wetuvupanamubebanolew.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9736978ab---54187837012.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/9339993928.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608feb79a800e---64011967563.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/02630321401e738ee6eecd3b2bdf663b/jadutolozolipobufut.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/fawebuvugotonase.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/vobanedadew.pdfIn PDF document text
    • http://benefielddarrenfordhicksunited.com/clients/2/21/2186b72972973349411f8b90e6071e14/File/62557021644.pdfIn PDF document text
    • http://deforma.it/userfiles/files/gixez.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/midimere.pdfIn PDF document text
    • http://wwstationery.com/files/file/lakud.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/6858175042.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/fnoqfcgsefv5gr2c0f5s36h349/7061548829.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/4164814624.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/7f3af6acba1324984641c2b7f2ecf0fc/judabanevalo.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6317463540---64905818372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=honda+city+2014+owners+manual+pdf+pakistanPDF 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_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 11536 bytes
SHA-256: 1b218d742b738c2a3b9a1a31a5c1bc09a569098d2963c3ace1f77755b5102393
font_02_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 19676 bytes
SHA-256: 68be62d1602676ae90865896a16524148f8333c1bab37760964acb63dff101a6