Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc0ffad500a9a36…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 02:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 716bdf1b54c0b0b26f7644ae06bec316 SHA-1: 2b2d707073c42956b252553729c15261184f98b7 SHA-256: efc0ffad500a9a360888194eb4767c6025ac264da57c674a46e30435d907ff55
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to external websites hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6be475f6b2314723b7bf5dcbd50f70ef/26164689643.pdf In PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/jujepozonewudirazipadadu.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/89964713199.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/xizidujinemusikorid.pdfIn PDF document text
    • https://onlinendttraining.net/files/93575692358.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/rarosovidefifuti.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/33781285426.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/66954575484.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/jenoruniri.pdfIn PDF document text
    • https://kaparatt.com/images/File/tovunidasebozaliz.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/96485548472.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/nixipewenepaxujupemenoge.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/tadanedu.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/jibarelalesolagujiriroxi.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/vufiwobamogap.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/35529872645.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/75c31c4f869b26f33b629e0dfb096947/padutuluzomalovum.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/tedijefagagel.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/noxetipotitilexisiwinabil.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/pazasopuwagupuvu.pdfIn PDF document text
    • https://ms01bet.com/contents/files/putikita.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/vewilezino.pdfIn PDF document text
    • http://elsped.hu/files/file/zesijopos.pdfIn PDF document text
    • http://rc-modeller.se/images/file///61462690272.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613104c9c625d---30705097935.pdfIn PDF document text
    • http://e-sportis.com/images/upload/jililisokowujefuzaposiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=go+go+thomas+mod+apkPDF 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_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 17236 bytes
SHA-256: 539fcaabc31ffcf386ba5001834e0b15fbd5d2259da1ef07a853b99551da634e
font_01_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001234c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234C 10496 bytes
SHA-256: ec34b98cbd22d8969a4b1ad6af13dddd6d9628ef01c12ec56688332afc3722ad

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