Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ae88fcb9756d83…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 18:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d720e81cff4e6e9ebd1736841aeffcd SHA-1: ef9b2789afc786c1bdd7ceec8e515541352ffdad SHA-256: b7ae88fcb9756d83512a670f2a0a91adbeb0b5e7cd239c9e1ce49f6a80ccb9e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, forming a link farm. This suggests the document's primary purpose is to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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 http://olguanaokulu.com/upload/file/vupibebiviwapojoreb.pdf In PDF document text
    • https://ivanda-commerce.hr/userfiles/file/1646262393.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/82531243715.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/f4c9mng5hrqald7ut1veb7ktoh/20822099023.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/larunaru.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/74cb68a200fb8d5afa1467929bbfa589/72267929103.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/pevogegelixuvesomux.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/situdemabajavugitojiniseg.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/linofukolefox.pdfIn PDF document text
    • https://badoza.net/userfiles/file/pusakato.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/324e33f63b0dfce3439397975f73c484/60439587369.pdfIn PDF document text
    • https://proia.bg/userfiles/file/dojejerila.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa8472ba61---nofinasilegeboxuk.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4b116c2e099cd36c048014be6dba94d3/33215523999.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/1165131653.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/65806214068.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109060602226283.pdfIn PDF document text
    • https://hsse.cl/files/89225425485.pdfIn PDF document text
    • http://dalaichau.com/files/darutizudorilexavivuvexut.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/pidapudevumapumubagizut.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/59994895401.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/43830150225.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/37331083871.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/43131127809.pdfIn PDF document text
    • http://geasit.it/userfiles/files/50686577178.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/17902923910.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff196de4fd---bamobemovomotubapupelew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=scarcity+vs+shortage+worksheetPDF 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_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 17844 bytes
SHA-256: 9d4b09a406eec28d9d8f8786441033a6e9e1f7527387c3f54e89d607d59d3eb9
font_01_sfnt_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 10792 bytes
SHA-256: 74e3a203ab672893aba0727e7186450be701a6ed5c70d19ba902b73ba00c7b84

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