Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbed64df090e13b1…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 02:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 484528f4ab93097d0c2035aba859ac0b SHA-1: 88972277fdf044ee1172ac4121471bea5b1eed86 SHA-256: bbed64df090e13b180a6e1da262b19f41411b7d63ca3ecb446c1eb9fd2388d67
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised WordPress upload storage. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nunepuzipef.pdf In PDF document text
    • https://cailux.lu/userfiles/files/kotobevisupivir.pdfIn PDF document text
    • http://secretinvitation.net/images/files/kawadotajekute.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/kixepuvemizupuzodo.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/49510503043.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/76522140001.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70361e69e---1192159887.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/746340b9f6207e4685fc021be2446177/51885222176.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/porej.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9f00f22c---33488448170.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613997d810e5f---91219508104.pdfIn PDF document text
    • https://digicpictures.com/downloads/xegumijebamerexezojulix.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/sotipafe.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/34617684491.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109161110414438.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/85803679856.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/51711982702.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/vadovutafu.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///bobutimesatogazuloxuso.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210907211121.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161359405c32e6---wetotemalivepokowowuzigak.pdfIn PDF document text
    • https://svltv.in/userfiles/files/94428664457.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/d4a296dec91f7f56a10af09f44bd2e0e/xewudefopamoxokolirejam.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/19531737877.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/42760735646.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/99966247256.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/28741847760.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/vuxujatozapamube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=send+location+android+whatsappPDF 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_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 17520 bytes
SHA-256: cb2dbb51f2917b2d7effe6fd03140073bbf001ef63764bdf6b40703d667db600
font_01_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298A 10772 bytes
SHA-256: ca94e350c4bfb7573aefcca00bc0179743d5748e5fe0978d656500cc763ca336

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