Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbff0912f44aa78…

MALICIOUS

PDF

73.7 KB Created: 2021-09-24 08:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cbb797c67ce4ab423ce8c3d095d2810 SHA-1: 3ccbda7af7f7999461593b0ab2d7afb00c9cc782 SHA-256: ebbff0912f44aa78ee62823c20e19fb96be8934d895d9a71813f3204c6ae891e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. The embedded JavaScript likely serves to download additional malicious content or redirect the user to a malicious site, aligning with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=free+office+package+for+android PDF link annotation
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b23cb18e9---lazegim.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/rexukuvebedixu.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/kamanut.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/lirutesetagobogalumikaka.pdfIn PDF document text
    • https://nexapos.com/upload/files/86249537269.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/mokabegarir.pdfIn PDF document text
    • http://infracsap.hu/files/file/xiwimuremez.pdfIn PDF document text
    • http://liluby.com/upload/file/kadofonoru.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/75874631139.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/fivoxufozaja.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/50695595104.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/96946691127.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613396b03fdd1.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/61596587263.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/vibezosebamunemerutewus.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/junopowelamufovigigefil.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/kakobudonevu.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/86470240033.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0604c381e921e6529e24786a50c866a5/82506100416.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/fojomunonuzozol.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d496a014e8---bajetodefazivuxidefigo.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/85693144138.pdfIn PDF document text
    • http://chemsdano.com/upload/files/fadafi.pdfIn PDF document text
    • http://inistor.com/ufiles/files/xotomidaxelolatilakabuj.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_off0000be3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3A 16564 bytes
SHA-256: 9aecc7b723f2f3b5c068e50da434abd064263a67ebcc5f48746ec9c61110b544
font_01_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 10552 bytes
SHA-256: a042d4f4420398fb8fb3d1dd32cfd5be7efc61359f81d928fffec2ca14132e75

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