Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bff3d67af8c2b4…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 01:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cb94b014dc54b5a659fc423d1f81c9ad SHA-1: 9090bb52ca30d53b6a4be3ad0cf00494b75a86f0 SHA-256: 10bff3d67af8c2b4b71b232edfe4965b81721afa4c68ce2177a20de0c8eb5ad3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm with numerous external URIs, many pointing to compromised CMS uploads or disposable hosting domains. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://a2designbg.com/userfiles/file/puxafojo.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/618ae2d1a37a0551a563a3187418f1a9/99012954343.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/c89c952f5c94f31b0572cc2bc219fad9/vamomozeziluxo.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/31517121863.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/44324894288.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3ba2f4f05ebba87d9b1e037561d4285c/66701721008.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/34562657511.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/95981270990.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e2186f644---zopepakedidaxodo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609416fe4a95d---72351817893.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/80103190991.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/qj4d74gn29obto8gvqm7b3g968/gijopomakupelafo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3c3a0f78080d65e34253788c95c47042/10600007965.pdfIn PDF document text
    • http://short-story.ru/upload/file/wiruturedoki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd001239bc---74602674049.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2ecef4153---fonulemok.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f786afbe639a5dbdc9570a239399d899/42783386795.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/eaijn2ue1u9853mic5tro395pv/69917640215.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1e160aeb---letojufupakizoz.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1i5g231b44vttfl807geml7o4j/guzudeguvuxu.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lefovuzobedadomoj.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/93284316367.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f9916f1285b51f9c3ceb277ab26a2f44/7847805904.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ccad400ee5d---98193336004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+sun%27s+energy+produced+byPDF 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_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 11128 bytes
SHA-256: ecd41d9b4a8d17f97ac8342c245c5d1d40f57a869d4096bd707aa52ccf77324c
font_01_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 17088 bytes
SHA-256: 9a5207519ea90e1ab2dd46cdc88308f2060179d78840852de8cce28d23da9c9b
font_02_sfnt_off0001378e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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