Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fe17beff617505…

MALICIOUS

PDF

86.3 KB Created: 2021-07-03 01:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 05020aac46832a222d4f8d43b7d09af1 SHA-1: 9dfeb4ac9ccb6282614a7feffece5542198dada7 SHA-256: 87fe17beff617505bd89dea65790f4ba4024911ba6f941e37d40cf6e57d0a28e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload directories. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple links to potentially malicious sites suggests an attempt to lure users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a651a5c817---41400893983.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210606120511.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xuwuwogarezud.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607409a9a2b93---wuvejevibuzas.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b88cda91feca36f50a977618528bcab8/puvadofed.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/boxemimu.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/93676604104.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/zoderotogudiziv.pdfIn PDF document text
    • https://umartravel.com/files/xatofijosujiforigiwov.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be979f0f3f7---205889875.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/gebel.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b277af8a---16256341345.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107010525468619.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/nerefijubudofov.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/gibekebavitutoti.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/01jasbs6n1e41uhnpha87rgjv3/mapikigi.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d34bbc1daf---47661945798.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/pozev.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2e377fa7c7bbd42587d0962a58d59529/lugunomesizirixewowaro.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/58065942064.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607569de3ceb7---15409394004.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/23829482017.pdfIn PDF document text
    • https://atl-50.com/files/file/87566633432.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16082623c81626---vuvopisazemi.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/pesolulozutigivupil.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/lewubosiwopap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=spark+notes+lord+of+the+fliesPDF 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_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 16648 bytes
SHA-256: 055a9575e6a39f203395f5895f339adcc59e7ebefba2d69e04f2206c635a8699
font_01_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 10760 bytes
SHA-256: f542cc297e1d6f911006aca03b0973586876ab74dab843febd7b17cc616dc89b
font_02_sfnt_off000133ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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