Malicious PDF — malware analysis report

Static analysis result for SHA-256 522110f6d7b92522…

MALICIOUS

PDF

99.3 KB Created: 2021-10-10 14:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f40fed8f8c330c627760f8af4ffc2a11 SHA-1: 4632a586f0f2e06eab417aa3141030ddd59e4371 SHA-256: 522110f6d7b925221553cfbcd7b8a94ac114030837a122b184bae2ab36800062
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous disposable hosting sites, many of which are compromised CMS uploads. 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 direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://infrive.ru/uplcv?utm_term=gta+2+apk+for+android PDF link annotation
    • http://ilovehikari.com/uploads/files/28723136137.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161595229c5cd5---vepevutuxinamepezigova.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142670388f6f---60965614607.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/82336285997.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210901191631.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/reruxefamifirax.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/28859802045.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/xosajusotifisegesow.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43fa63d89---pivujejikodu.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/povafixelomas.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/87930292626.pdfIn PDF document text
    • http://juentai.com/userfiles/files/39569194147.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/31770662216.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/siruma.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/depegilokojurido.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613572c9c9928---96945129131.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/detagofanijibutuzumepamer.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/38329405444.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/gonelag.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1a817a07cd1ec74d8a3a06d80490512e/xiditem.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/lofenazegojevaxaded.pdfIn PDF document text
    • http://moscowcharm.com/content/xuploadimages/file/nidekonuvazedosuguvumo.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20211002_AF255AA6F67D6EF5.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/bipurowubi.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_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 10396 bytes
SHA-256: fc9b0967c1458fef40eacdda1852272bd8286011968370cc128ad70d685e58d5
font_01_sfnt_off00013182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 20412 bytes
SHA-256: e5c8f7c07f938a0a7a9681abc9fad30d34fd1ac7986646cd22dc3552f2fe55ad
font_02_sfnt_off0001673c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1673C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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