Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0f87de5e7d996c…

MALICIOUS

PDF

66.4 KB Created: 2021-05-16 14:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40326b04783bb4835f8d8e3e697d3d6f SHA-1: f5b34bd1ee2bc73b36e8f7bbc0815cbf19b99cd1 SHA-256: ae0f87de5e7d996cc78e13ee481f98f04aadc32a354572d83d7416740471e070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/6af6446e11192fc3d16c6696139b939a/sezobu.pdf
    • http://bannails.com/fckeditor_userfiles/file/gefuf.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079a440b0cd3---70153720745.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3bd0606368ac42bd4709ea79e11fbb7d/5876694915.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a08acdeb234---38103938765.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e8e7ac30---tubiruti.pdf
    • http://a-kamen.com/userfiles/file/52287279945.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/aa8bd147e0271fbcac918583b50cc4d3/98691053888.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210507083150.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/27i9lqo4msgmafht0pbv92bc5j/70088938379.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/jonunup.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/lejapakupixis.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160806ecf22bc1---11018840278.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a17288289b---xamurosazaweg.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160807d8050db2---tejukepogozebifeli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+android+phone+backup+to+pc+software
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce61.bin
2b7bcc5e206d185ca89a18a4eb8ccf207273dc65dafa90fd1bd2b15a29dd9021		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 5556 bytes
font_01_sfnt_off0000e156.bin
8a4f3e57d58ca457e68753df7a3810859a23cbbcfbd73992f3c9bf6e4d65ffc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 10520 bytes

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