Malicious PDF — malware analysis report

Static analysis result for SHA-256 7439c0ee8f3c68dd…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 00:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d612d5ccbaf3ef2919ac4ef35939a6a SHA-1: e95dacdf92cbb3bdf0293f4cad8dd276051b9a6f SHA-256: 7439c0ee8f3c68dd77cf1457347a83f35c53a50d9af964a505cde9434609bb1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://spotiverify.com/ci/userfiles/files/dixan.pdf In PDF document text
    • http://hoshitorionline.com/uploads/files/48446430359.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/xafepuxola.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0f694bcd03d952c799592d5146996a55/sarez.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/13624175157.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/707d829284300becc3c0b7f6e9aaa6a8/gupilijutunutifenozobus.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/43604007137.pdfIn PDF document text
    • http://vejwun.cz/images/tedifowubesusuxamed.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/47473776461.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b53b71944f---zevuxo.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/fopatade.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/gusefugugijufodolu.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/46684553249.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/22065615139.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/47957237463.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/metafatedej.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/rewonagon.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/91120599653.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/19626108510.pdfIn PDF document text
    • http://exima.kr/userData/board/file/3979690863.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/jokuzinimokubokijilazobon.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/59195994785.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/zixadaz.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631190931_1.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/rimomafefuranut.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/95067734912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+text+not+sent+tap+to+try+againPDF 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_off0000b119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 10720 bytes
SHA-256: 19a5654afddade979c2e65c3dd8fc6beebaf54b828dfb190f328e318838df2be
font_01_sfnt_off0000c9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 15892 bytes
SHA-256: e6a235406779e30b153f92e0c74876a57b398e489e242e93695a5baf6f3a1ed9
font_02_sfnt_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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