Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7885a4d07c39a0…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 11:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa445fc4051a0afac72f6f5a5e9dc78e SHA-1: 1e249b7a1cbe9cbc87c659fe9ee99c3653760d01 SHA-256: fb7885a4d07c39a02a52781acb4b449ba84557349ce16d632c3b6f2bd200d992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or phishing pages. The presence of a link farm on disposable hosting further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://biancoacolori.it/userfiles/files/jipod.pdf In PDF document text
    • http://chapelguild.com/images/usr/8009161606.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/duwaroluloporibifukidexo.pdfIn PDF document text
    • https://redac.ch/upload/juditugolefebobilutexipol.pdfIn PDF document text
    • http://retrofotr.cz/files/file/10808300981.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/5328219593.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6702070ae---31110095384.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/kotuzanonulis.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/53848369401.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/60946193485.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/nozuzijebetobupodod.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/fexud.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161460069eb678---lukupawigozotugoronosuk.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/wigovuwozavonukurub.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/dakozuvibi.pdfIn PDF document text
    • http://medica-brno.com/files/butoxu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a079345d1c---11441708348.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/kozapemofake.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/39704572784.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/3019983516.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/21225300712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+n+emojiPDF 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_off0000b502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB502 10044 bytes
SHA-256: f72a070cc45c5104218ce44855d68f1bfad2edb1213c8c1f64f72f2b8c782e90
font_01_sfnt_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 16768 bytes
SHA-256: 6bad0788e44c9483dee90ce8d7215238b74e347621b2477093dfe5510399bc84
font_02_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1