Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb0f14d9803d96a…

MALICIOUS

PDF

94.4 KB Created: 2021-07-08 00:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0fc0e287e67fb0b53e435c3f4c30f9bb SHA-1: f8c25f2743833cab682268bb7ea6a59607e401f0 SHA-256: ceb0f14d9803d96a2160cbe1530eee477055844caa8b3cd2c068e869ffe1d809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple external URLs, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://drrajanmahtani.com/userfiles/files/3536399870.pdf In PDF document text
    • https://topinsolventa.ro/userfiles/file/xupokorawikigajadixi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b13218116fc---68072461299.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/vimakoxugikojukonefowobur.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42b26efac---mirozovetogafumu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa45025186---42169134867.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33c27e9e02---sitaja.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/duvupifegitasegimasenadav.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ed8a10e6---pezetaresekizajikupogepe.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/38668910311.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/15272199457.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/wepupunezavo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/409ed4026b969e373e34466a17667561/65647678893.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/wigogagupo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a632f3045c8---62705224847.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd27f73c4e---82695931725.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1995305c58---68986751348.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/sugewefoxawasexofidis.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/bj88jpgj6q78ts3k492b2sg5em/jovobediwavunora.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c58a866e7b---kisupuweduvavijuromotire.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/dobez.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/761882c9d3ababce15c3b698c08162a2/jekebezusex.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/93484672793.pdfIn PDF document text
    • http://beta-rc.com/upload/files/kekoseledijapawew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=testing+hypothesis+involving+population+proportionPDF 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_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 18744 bytes
SHA-256: 104d64a8d11e5d2115c688496e7c16b8c0f90a533ae78661e1fe3e5d842496f1
font_01_sfnt_off00013b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0D 10776 bytes
SHA-256: d880817a5e3e8e4b2bb784dfd7a5a68c016b496629f8ce880dcad8697751af2c
font_02_sfnt_off000153df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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