Malicious PDF — malware analysis report

Static analysis result for SHA-256 268df559b17bde64…

MALICIOUS

PDF

99.9 KB Created: 2021-07-24 13:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb4d9548c35f42ba4045ebd15732837f SHA-1: 27cd1e4f2e3099c08eb5cbd67d3c94a2004d130c SHA-256: 268df559b17bde64336ac49a30a3d60b28b0cf1cf5efc05e6bfbdc2d56064f37
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external PDF files, many of which are hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the pattern of linking to potentially malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/6ace842db1f653eb22094d411fb25499/61772335525.pdf In PDF document text
    • https://songhong.info/userfiles/file/62029955236.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a90cc2aca681c2503b7fb6e8d068bd23/59055476995.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4ec4c3ac---26615653596.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/76789392952.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/sepojon.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b50e3504f---nikuxo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845aad04a0---88065482625.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d1edd7dcf5203d0132b552ec838b7f3e/95888287811.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bf95ac5b8---93205506554.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c1b87911---vorujinakugazifa.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088f72f81ca5---berenubonuvejiga.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/26191628658.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/teai3uvre6ljo2gvodj0eem2vg/rirazesafojogewasoja.pdfIn PDF document text
    • https://mauspro.net/upload/files/94569619936.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/motisuwomasadotorogat.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/76412616377.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jugevijijejixixuz.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/14b9b43f37641583605d0252397a6a99/3332161952.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aaf08fbe6---35980351050.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/635gpav81iggqmltv5od3u35fe/71794619526.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0s9qcomu5b4stbj0238aohd1p1/69158562305.pdfIn PDF document text
    • http://allycatering.com/userfiles/49396634559.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d9e70fdbb2d9e35ccf1cd46c64816f3c/86565139323.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2c243769cf9ca2484db3a493d7091473/16729334847.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3bf790ca5---57790876301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=anemia+por+deficiencia+de+hierro+absoluta+pdf+articuloPDF 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_off00011cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD6 11108 bytes
SHA-256: cccc2b936dd6db88feaedf8a7509f8d1e9bf69ad3f820a4d0cf7add1280c21d9
font_01_sfnt_off0001364b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 18796 bytes
SHA-256: 2342c661be1effa2765fd2d6a76b18d1ae4c2b752f7802d82ea44fb67e3f2d83
font_02_sfnt_off00016671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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