Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e1b15641d57e6d…

MALICIOUS

PDF

124.8 KB Created: 2021-06-23 20:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d4122ef6f3c718cf334ae9b55754b6d3 SHA-1: f7e727db72bfe94315e10f78a980e27b0b795c73 SHA-256: f8e1b15641d57e6d4509e86948efca4722939dd8dfad7e9932b1f3d6d29e7344
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607500c3d91a8---paxiwesavisisesegopopoko.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bebcf04dfe4---nimupanedeviv.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/57839863963.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b087136e1---tenabimewulis.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/subunupujelumoxetawowize.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/tezogatutifepa.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b857e012754---41811035362.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/linejufoxi.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/0011396c6ae78ec1f56ef02aaeac5be9/komelakudipixaze.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/14541901579.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1g9557pjdilf5uma1ono1ccf9s/bagowenolugejokosikefewi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37c2638e77---fefov.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c38adc119a8---fuwokezopozuri.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91fc78c2e---91469074717.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0492451f96d5474bce12a3157ff95bd6/28024419860.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/82056599172.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=2003+infiniti+g35+coupe+hpPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000172a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A7 5988 bytes
SHA-256: 5b3da48772118235fd55acadab8c80a364675610b1d11536a100f462b4852a46
font_01_sfnt_off00018758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18758 5108 bytes
SHA-256: ac169c1cf142ea2ffc9424c724a71e4e2c7fd2b303e5953306f6b00115cf1c06
font_02_sfnt_off000198b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198B4 12264 bytes
SHA-256: cff762caedd6fc595276c4d36b76856eb850b5f40f3c6f6d0917a4243bc098d9
font_03_sfnt_off0001c225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C225 16088 bytes
SHA-256: b5f1397982530d9e987604a9fc8467d56fd147c09520e12e54de27667870b356
font_04_sfnt_off0001d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6E3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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