Malicious PDF — malware analysis report

Static analysis result for SHA-256 50efb1fdffbe47ce…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 00:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 56c34c0e2be8e8d204e1ba56b3fe9e96 SHA-1: 040f707caae14e34759d4c8af42b72c9d705d90f SHA-256: 50efb1fdffbe47ce4337c6bb6519c608ad790a8b57389704bbb5b323dbf4d48f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=2017+yukon+xl+owners+manual PDF link annotation
    • http://nhuaduongnhapkhauaz.org/upload/files/senudipikipaxivapikadu.pdfIn PDF document text
    • http://fultonhighschoolclassof1977.com/clients/a/ad/adf64365ba34d951c098eb677b062caf/File/84140888203.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6mhk1nv72tsutcicg22hc48e5m/19873392328.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/u7oo795t2afj37flvk52kkv423/menuwowu.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/fidefiguv.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab25e0465---wigejilorotemodatudod.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/degatavusanunosiluf.pdfIn PDF document text
    • https://aful.edu.pe/ckfinder/userfiles/files/bexuxobexaduxirubukawuz.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/22501322072.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xisubodavexuludax.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3ed1d49ab6ec153f9eab47fe05a7f462/dumowaluvuj.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/sagexonujafugetute.pdfIn PDF document text
    • http://pvvc.cz/files/bolozinoriraguvinena.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/86593915451.pdfIn PDF document text
    • http://inistor.com/ufiles/files/53442092854.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/38549209135.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vtkr30ffbho55v5jekc7b0778a/50590263122.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/18868599993.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/danonugebewewipajiganisut.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/toxefamebivaj.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///kakuv.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/kotedeguwenepafowixarizi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a485818ca38---9364441561.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_off0000d342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD342 10820 bytes
SHA-256: 4f5384942d584a90ccbb102146daa4cb382cf2044b8c8a999dbb7693168e4e0c
font_01_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 18252 bytes
SHA-256: fb4183d4af1beb4b1a7def2c89443c86fe24a36fb3fe197e336cb9045f74892c
font_02_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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