Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b32406bfc6f761…

MALICIOUS

PDF

87.8 KB Created: 2021-07-01 14:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99289c950149fbcbc7e8fe39105b17cf SHA-1: 34dbb698155b4ffce982d1166742d2d8995e83cc SHA-256: 23b32406bfc6f7612096d0042bd123e19aec4d19662f5776d73a8816fe90a7f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests a phishing or SEO-based malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pistant.ru/uplcv?utm_term=how+to+change+your+league+of+legends+name
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/3gq8pk46ov652i6v8i4iil43fl/74976782177.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/aea7f00f67dbdd5b2a223012593282f3/77127467117.pdf
    • https://dietacud.eu/upload/file/fejosasunonawasebelip.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086e79e0e6b2---keriposuvegixorenogek.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/wibunologisu.pdf
    • http://ks4073.com/file_media/file_image/file/beponibefejaparamenevene.pdf
    • http://myphamhelios.vn/luutru/files/1319125016.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/vn9cd157cefj66qsit2qf6d2s3/siwirena.pdf
    • http://zdrowejaja.com/Upload/file/wuzovusagenirax.pdf
    • https://atlastoursntravels.com/userfiles/file/nibadadevewavasefe.pdf
    • http://omni-links.com/images/blog//file/bozidadurexilugukusi.pdf
    • https://activepymes.com/pub/file/faravetowadimikokisalu.pdf
    • https://a2designbg.com/userfiles/file/53490521396.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3ugap8brne98f5c7734k3pcrqg/pijogupimiwawifuru.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/lkbu1pegb7lm3a6110jpcl3kc0/numekovagomozivolitedi.pdf
    • http://grafichesirio.com/userfiles/files/23139811915.pdf
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/73350337575.pdf
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/23725420397.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d554456f3a---48940370608.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8dbea706fd98eebd138ad4b1fd945445/18499938609.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0a45b837e53096f90a0340ff0808acc1/lemegesadenufape.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6c2ce629ff0dce1c43ffb0e48c832b1/10927366201.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e4.bin
13a243e23b5d981dbf49fd393ea66f0833288afd28bd4113e2f6759e64210d3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 17360 bytes
font_01_sfnt_off00011e66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 16792 bytes
font_02_sfnt_off0001367d.bin
838028e24f95946d55d7a1ca558d4062596feeba2a726f2f077d0791d21987ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1367D 11124 bytes