Malicious PDF — malware analysis report

Static analysis result for SHA-256 9552781939ef4a4b…

MALICIOUS

PDF

105.9 KB Created: 2021-07-06 22:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cda56059ddbfec48f1cc37d530d0dec SHA-1: a12d4e70be307a514b670ba3ddfd5d76dfb23bcd SHA-256: 9552781939ef4a4b6da997eec4a27e8de329280ed6991eaf3e6fa44f6cf3f64c
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan. The presence of numerous links on disposable or compromised hosting further supports a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thesetnews.com/images/fckeditor/file/zapiraxodelakiz.pdf In PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/vatagobuvutedetorakebep.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892b5109cd7---jirotolupe.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/25d7236c62235f30b024c53f57a2dafc/varofepuwaradol.pdfIn PDF document text
    • http://3will.org/soubory/files/56517188813.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/38660749980.pdfIn PDF document text
    • http://dges.in/userfiles/file/13246440981.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d7413db69---lutosejuzanuvam.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/fedisomubobipaxemi.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/wiwixapilasazup.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990e95adf98---49109071558.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a622fa78f2a---nesodazeva.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4912611a---67488050538.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9856813791---88799479597.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0eb8ed0a---kozujenizezotiraxalukum.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/h6hrihbh8lm4c0tkpkpi21ks5l/10378279948.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/51bb661c9e6c6ecea4ed5c776b84a6ba/64634102149.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b651ceb0e28---45979853261.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/kojixawarolitarewejanov.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/hmofvau2mqjgantq9vdp2hcbcb/talutafujeduxa.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/19222712151.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/misilegujiretarovugerete.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e3b70da3f---panilatananofuza.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/fijizanuwafevoz.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160824468e5b16---62031534558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=creative+cv+templates+free+downloadPDF link annotation
    • https://editors-cdn.template.net/asseIn PDF document text
    • 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_off00013a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A38 10964 bytes
SHA-256: 42538234cea707dc050de42130c0c3c4b04789f5cc2fe7543ffaa95d6a4c850c
font_01_sfnt_off000153b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B9 18220 bytes
SHA-256: 981178857e5739244871e71809cfdd6a60d93c0f55183eb384e0949336dc524f
font_02_sfnt_off0001820c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1820C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1