Malicious PDF — malware analysis report

Static analysis result for SHA-256 15acedebf20eb5c4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 09:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b29ed3544547e76db1b9db3e112894da SHA-1: 0e1858780416e07375bfccfcb7680cc80bbfd1e1 SHA-256: 15acedebf20eb5c477cffae65a21a64f45ebc3f3417423d86b7d95bbe3bef59f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external links strongly suggest it's used as a lure, likely for phishing or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/71dd77079009c0e6cfef5903828d85dd/vazijafosub.pdf In PDF document text
    • http://integrotech.eu/zdjecia/file/dibirububibefa.pdfIn PDF document text
    • https://abeess.com/userfiles/file/40160071269.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/jinetozujes.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/bugak.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/13727355850.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/bomuvurebol.pdfIn PDF document text
    • http://hybsch.it/upload/file/95383780860.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc88cc552---26780321579.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead560cf00---dejakafurum.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/41955729859.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/e4c8d0251ffc44f7ef43b028ab33c6b5/48513118187.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804f601716c---zupodesor.pdfIn PDF document text
    • https://stvorki.ru/files/file/fegozofovefasawobaziz.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/86490235461.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202108301210384545.pdfIn PDF document text
    • https://t2sc.me/userfiles/walufalama.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/88203186387.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971f100d45b---35526124858.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/8199181634.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108121709558317.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/78229672939.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/7kboiup9pstloonva3paog1m8l/femenamisora.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6841e1bbe---bifolusepizev.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf3a8232f---bexogujulupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lobulos+parietales+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_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 10584 bytes
SHA-256: 921e41d4884a42ed07aeb42244f42638db1781dc16687c139e3e1f1fddd0fa8e
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 17280 bytes
SHA-256: 9230e8de127d2c81ba3e80bbc5f49617a71b1dfcf8e973c765a8c7a5d97f906d

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