Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba60a84f220ec62…

MALICIOUS

PDF

73.4 KB Created: 2021-10-21 04:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1d8eb1e7a820b99fbc8464371858f00 SHA-1: d6597a4bb7ea9932c51a80bd09248b10754b4867 SHA-256: 6ba60a84f220ec62e9751fbc0ee256adf26a3e26deb0f53a7da0aab9532fb954
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicative of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://ilo.tasksplan.com/userfiles/files/dodogunasomonodilo.pdf In PDF document text
    • http://pachinkoevent.com/sites/default/files/file/mumitefono.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/79893786408.pdfIn PDF document text
    • http://195exim.com/datas/files/legafojowuxixubujezin.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/37887761915.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/98371350476.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/koxunimugakidinaxopam.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/pexudoninagojazev.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/19240878251.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9386a91fd9732a36bd4163dc012088d0/xibutilanubaz.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/lifawirolodosowutibo.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/fudozawupuvezeminif.pdfIn PDF document text
    • http://tyextractor.com/d/files/kiworitiwulipadewa.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/82301149645.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1616cc68700a33---rerudam.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135b60e28a92---49722836864.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/19417369115.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/67124583955.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/26757787833.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152210fba4ed---80753160791.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/n8cern22p4jiidtuqpdfoctkc8/kozizutamasag.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/movazat.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/27601067942.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/23D8k0Ec_6w/uplcv?utm_term=history+of+microfinance+in+ethiopia+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_off0000bd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 15920 bytes
SHA-256: 64d6153cc95f93c757c11d83b15ffc4a28d8bf06d0947603912cd43d25be8875
font_02_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 10944 bytes
SHA-256: 0e1ec014ea66e60b4a2d4c0ad871ad9e614eff5f71196959735d5bd53febf8f8

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