Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fecfb680a239f7…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 12:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e563f21e849beecc9ebdc06c86c9cd99 SHA-1: 99a3dcbba753162159c5ccdbb0360b58c02d5380 SHA-256: c6fecfb680a239f7f756f40ba69166ffae4f64ca404dd287d6ce0f2ff1a55bab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a high number of distinct hosts indicate a deliberate effort to obscure the final destination, likely a phishing page or malware download server.

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 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 https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d36feda6975dfa23946ce782301b0f9e/33362308174.pdf In PDF document text
    • https://internationallanguagenavigators.com/media/suputuxubel.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/jedowafozejitebekefuna.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105191638.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d7efb20d2c6f2130ddcc189dcf02f3dc/90501413515.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/rofasosipafesubolisone.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/29969473166.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/nvsimrks5v13hd12qht56t2lj1/lanugaxomizowas.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/ketogafu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8fd8e930c1be0971ba51471cf347add5/tuzuxurupotegebin.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/vijajebogerulodulubewi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160efd9667894d---jetalepomonilulawop.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/3397869358.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/lufulomaxufuzazikudaxij.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/68716376414.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/2jv1pgu9im1t98l3mvcbo4nbug/vomalijaludofa.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b8668ce1---13718684388.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/fodirevitokopipogupupaxez.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/jiparifaxo.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/10975662959.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/42236783718.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/13384335626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=2000+dodge+stratus+se+manualPDF 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_off0000c3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D4 17872 bytes
SHA-256: 54089d95ca8f9bbc170bd194bc6aa50f06bcea64f0f539e777c2bfc40884d259
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10744 bytes
SHA-256: 10d7a6fa474075568656312d6e4a9ec11a5e052ee400622ff5f7c7979ae2f392
font_02_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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