Malicious PDF — malware analysis report

Static analysis result for SHA-256 93124c07b1dbeae6…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 07:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0fa5f224c8657534c7c50bfd3347d655 SHA-1: f1385f88f5993f26ed175571d46e734f4d2f4441 SHA-256: 93124c07b1dbeae6df4e188c65175bae28bf9b48e920ff3feab26e9f754bf227
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://crysiq.ru/uplcv?utm_term=cisco+switch+2960+manual PDF link annotation
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb7ba5b450---sibivepavewopizinewem.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1fa08ba0a---81894421712.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/pusedogivedutip.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210525143139_1590740241.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161071257b4515---zadilojuxasogati.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210801052549194.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/mumotafiminanejalilati.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d89c568a2e2---31889912289.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086cccea2c63---9377123447.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/gijupup.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/jorugibotifi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de9f57d74d6---97259105630.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/52720236046.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/25409751590.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/sulikuju.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/13ad4bfb154897c7b55031fa83d5de00/fakagifugidasote.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/xixevazozelanegutib.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce15c605d---40370811413.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/mirufeba.pdfIn PDF document text
    • http://nwmanagement.ru/generic/uploaded/file/59281450541.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/xoguvifapodije.pdfIn PDF document text
    • http://dc-536514926e84.632.ch/ckfinder/userfiles/files/mamexunuxolitugimavan.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/tesivutadakisabevevatop.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_off0000c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 11056 bytes
SHA-256: f30c540407cc492e3624825eaf9f7da4499015cced070f27b91bb4ec46651dd9
font_01_sfnt_off0000e34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 17368 bytes
SHA-256: 222362a26f8e0b124ada1730d95cbb5d0434cd10c57aa7c35069b196d035bc5a
font_02_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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