Malicious PDF — malware analysis report

Static analysis result for SHA-256 107f0a8d00edd137…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 18:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93569a7d47d06865448922fa097018a4 SHA-1: 7bd42732e3e432e41def01d9267fe8afd7e68417 SHA-256: 107f0a8d00edd137dd43d4e3be3fe10d2e558d672d256a105fb67770362da841
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bluekeydigital.com/images/pic/file/26532510310.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610e000cc9063---riwusu.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/13256579928.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f071eac5---60509566587.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/vekuxogumatuvasut.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9166b7c0138c97db7a92c4aedb7c4d35/vitodida.pdfIn PDF document text
    • http://wamer.org/userfiles/file/riwefezuled.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/76043466589.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/90898857443.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e7af1a5f0ad96c6808b4dd51b14de420/gunuminojigakuxolusexul.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1ff4818fc3bb8f180411c565e7971b17/20111956743.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d5d7794d---25032523521.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b80aec1b---nakefagixozilejovijum.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/23261762264.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/69212271786.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/8186788951.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210606_0A886D75FD18B67E.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/nalaz.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/24338771270.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/54149499893.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44c146553---75219523822.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ed934505fa0df1b2809a59368c831549/musorobisomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pico+iyer+books+pdfPDF 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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 18780 bytes
SHA-256: 55b4278d70a34816ba15b06f72869c054a141e4f200ac5eaf76f9a84adc1ac72
font_02_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 10548 bytes
SHA-256: 3a5cdce507b46dfa55499e3a1149d707c1a50eed2b1fed88f8f3abaf8c28fe7c

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