Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eba18d5f793dc21…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 10:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1278bd71095d2ce5818c8e7a1d14d42c SHA-1: 74158d5c0863b584e742d686bf3063b18395e053 SHA-256: 9eba18d5f793dc2181fe68e45c65f24bceea6b9de6f4559628fef7a6d95c7e33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16118db6bec082---jerosumomud.pdf In PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c504ead267---liwosutapoguxefi.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/74442696485.pdfIn PDF document text
    • http://cosyromania.com/media/file/guxetu.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210611_a21f9.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/62489787639.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09b79ff9e---43785225167.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/31035391193.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vaduwelufixalabizo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/58htf57v18mnqdi93aq7sfdbbp/sesuxuzuteferu.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/daxepevibodolupemokused.pdfIn PDF document text
    • http://uamarkets.com/images/file/ravufosopadaboseg.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/nerifa.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857b684f63a---81276193463.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/56519216212.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/momuxuxulo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/effc7346d7fb4bfb34ec626d9df09951/49546306041.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/25358408460.pdfIn PDF document text
    • https://polaria.cz/images/file/sekoxupemajalata.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/84137515196.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb75974828a---46330870877.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/nivoparidunizuvejigapipu.pdfIn PDF document text
    • https://pepsima.biz/files/file/pevepesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cerebrospinal+meningitis+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_off0000bd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4E 17192 bytes
SHA-256: 164612b0ef0f5fc9aec559c608f88732b6f46f8e020d2b4bd466cbaa0b9ad898
font_01_sfnt_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 11012 bytes
SHA-256: 13a168471dd9d6f7b2af210885da380fcc8e46fd80eb88441ed6fb8a2f3d176c

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