Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc24047c9e1c71ca…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 21:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be42e455b00c5bed89f96b8ef6e25ddf SHA-1: 5f5efc763a714546f1f5a3cba11a1f3a7277326b SHA-256: fc24047c9e1c71cacc8dfb16450f8f3914a1b4f6a99765f32c4e372633087204
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to conceal clickable elements. The document embeds numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely intent to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inprovitcolombia.com/ckfinder/userfiles/files/latafipipiwok.pdf In PDF document text
    • http://barefoot.pl/userfiles/file/56534757593.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/dotodej.pdfIn PDF document text
    • https://nevisnews.com/userfiles/vuzufewupabusutalunaz.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/81028490556.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f10ed401b---25473753872.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/942310166.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/26471253091.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/53578655739.pdfIn PDF document text
    • https://irantruck.ir/data/file/jogipu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/83e0182ad161b42f8933086a92203ef2/ketasokukodalakowojus.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161333a0a09834---95150787766.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/madab.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/pudiwitawibaxafadek.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/sopobasejuwemabivejin.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/25003922422.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/soxofabef.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/45245568700.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/40821697758.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/semabupuvu.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/40692547349.pdfIn PDF document text
    • https://es88.tw/pro_pic/files/7860053235.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/pewowujazali.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109171221335674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hill+climb+racing+2+hack+apk+downloadPDF 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_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 14348 bytes
SHA-256: d968750ecffa36fa6199eed4e53392fb82af9da3e6050fccfadcca23ba7f306b
font_02_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 10992 bytes
SHA-256: 3dd2888296fdb6c07a3366aa6d7a38a14be0547866b995f803ff6abab107c424

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