Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1ec79ec6e18efd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 20:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 270cf265d2df1ba51636ba486028598b SHA-1: 530f6ed1037ef2b817ffae327a99eeaf7f3efe12 SHA-256: ce1ec79ec6e18efd58e36a2b4cc66c206757f151e766eb9b5cc11757f037d034
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself does not contain readable content, but the heuristics indicate it is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://xn--nmqu14inmf.com/upload/files/85774408293.pdf In PDF document text
    • https://tecnibat.net/uploads/archivos/98016592820.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/63186016335.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/zuzemonafeka.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607168384bb12---87027547418.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/xadebufinufijabovodow.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/89754834041.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/oue2nnju2m8h03qlbcmr3b769p/vegebexegu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/8913fa0ea24ecd95dfb15047d5766323/vedobaresivixagakovoturuw.pdfIn PDF document text
    • http://nordavril.com/userfiles/file/tebebudajeminokuj.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/vuwotulol.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160702a3b825bb---76439181964.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/99634049202.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160886ddeea91d---nowedarenugemexunikudu.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/96731893448.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/86ln44f11cfsnciaqamn0f0p5b/mugobep.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/firovenafuzuwim.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125501577e1e---luzasisowepuzuwew.pdfIn PDF document text
    • https://designclarf.it/file/gemepufususofaworas.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0it7f35molh5m0v1hc3mu5nrn5/xonesorogopamo.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/82a9885346cb8dd9d424b262c7a3b791/gizerot.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/41490057689.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aac2a8004b5---99549953284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rational+functions+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_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 10524 bytes
SHA-256: 11e1bb3aee0be1ac6db1827e74de8a0d8db923e626f5eadd10f8f39860ef7259
font_02_sfnt_off00010c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 17056 bytes
SHA-256: d9635275465509eede242a0fadae3d5507a9a4335ab7624e1d7662151dc0fbab

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