Malicious PDF — malware analysis report

Static analysis result for SHA-256 db09adbadeb3ff42…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 00:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04a8b74e8efd045c80a785d874f43a65 SHA-1: fd2ad8be69c17828f27fc26b11fd63e8e892e7e2 SHA-256: db09adbadeb3ff424375f89a172ecd0a690a1ae4adec3e469a2bebc51277f635
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to leverage search engine optimization for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/11c221080d71d17e722e3d07a1288a9c/43253396473.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e992b98ce2---2284638856.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/tugivuju.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ab69c98e7---sogalo.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/61352322406.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/93431342788.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/58da96e53dbe661043e2553d208d6145/vajaporagaxaje.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab86d8d6946---pevovebugolubopabif.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/nenanesafuboduzo.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/45616001766.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/wujiw.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/golawuwojezazuju.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/92256325582.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/dcdc0ee59251f77ff99d796b979e3afd/banumewonew.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66ff9d1eaa---70190186451.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/97816283368.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/wololamakomujege.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd62d3636d1---25598157217.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63e0050f5f---kefawumuvafosukipivu.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/64976600035.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/5781533835.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/vopuguzadukixugabidusir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pointless+book+pdfPDF 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_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 19280 bytes
SHA-256: e40a8a0c0ff0c6c8d16d6d4ab232bd424714d8dda081ebdb3acffadf19f9883e
font_02_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 10460 bytes
SHA-256: 5e3a2802f9821e086f9821f3a6efb6568bd030b62631a62f5af791335ed0beca