Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8caf2b3035eaf25…

MALICIOUS

PDF

89.1 KB Created: 2021-09-20 00:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93e4a3047ed2a743ee0c353335193e9a SHA-1: 74884291506ac4e58831e3b447e5d4e9fd34e98e SHA-256: a8caf2b3035eaf25b23378914ae005f95e309a220b7e1bfe5725e9023cafbd37
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'compromised CMS upload link farm' rule further support this. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=kof+2002+unlimited+match+apk PDF link annotation
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161380efddfaa4---visele.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/sozikuvajesepe.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/bijonejolek.pdfIn PDF document text
    • http://freeski.hu/freeski/file/34093772579.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/nunidivex.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/70pvij7ki84a74cc0jkrca3uep/varobigedipivexos.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/8709650059.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/30440794139.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/nowadakeli.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/sujimotesuvipivope.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630722156.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/96625635252.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/756226ae8f167f2153c7526a4e02945c/58752487831.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/01abb7b1ce40e69c7ddd096d2355a530/kisadubu.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/41559852822.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/88137433104.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/2962229747.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16144b69320cda---jixapa.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/fa0a5bb2cb9a58f211758f64f65478fa/romiboluxafemiwokizosemi.pdfIn PDF document text
    • https://themalc.org/files/file/tafoji.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/zaxejavipudurarovatatigin.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/38f1958hnl9qa555o1mm7vhe8s/85993489465.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/50935192456.pdfIn PDF document text
    • http://besteva.com/upload/files/tikix.pdfIn PDF document text
    • 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_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 19928 bytes
SHA-256: cac4188a298c86b16d2ad452727773b1eb762151c04331f695f63d509a6eee5d
font_02_sfnt_off00013b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9B 11044 bytes
SHA-256: 7eb9a9d29ad706e37121b0b0f95449086d1fd3d14d1f03eff2ec44944293cf27

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