Malicious PDF — malware analysis report

Static analysis result for SHA-256 acaba4f789bd0c86…

MALICIOUS

PDF

76.1 KB Created: 2021-09-02 01:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4068a793988b9186a03124a384218f69 SHA-1: 122a6fa2c095ec4e4528ce4f9a8918ccb5632c4e SHA-256: acaba4f789bd0c868c07dab362df6c8ce50b3f79e21566518a40cb7e3aa56a9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to manipulate search results or distribute malicious content. No scripts were extracted, but the overall structure points to a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://sergiomauri.com/images/file/24183254909.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nslf6daue5o7hvt508qkq1g427/51636166642.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/fepudopexemenet.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/asj937gv613gnmpi0cn1t679un/kekiminijokinal.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/64930016419.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/86085606563.pdfIn PDF document text
    • http://linker-apps.com/files/bedovaveju.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/55dab4e668c60a98444e376cb88bbc52/fuxolutogu.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/mabinomiwukokazidideb.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/93512866580.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/lufokotemiv.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/99731628395.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/58666591941.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/xagevagipinezutavex.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/21073023330.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7c39b9c9be4a2b37fdcad43e283bfac0/16352799192.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/23609947540.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af81d05900---84874711723.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/63922171348.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/49909301872.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/36482602949.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b91db671f---79181292238.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eabb6a736f---vinalorasod.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/47568739230.pdfIn PDF document text
    • http://abnicum.ru/files/file/gidoxesudososebif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=9th+science+guide+in+englishPDF 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_off0000c94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94B 10440 bytes
SHA-256: da23b1cc84e4bd5ddbe7675b81c099865d8cb4e4f8781a896585ecb03ca39690
font_01_sfnt_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 15788 bytes
SHA-256: 791273879b449a55de5900eb6243d1ce9539ce2eb9d93818d75538543be563e9
font_02_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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