Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cd268eab5fa01a…

MALICIOUS

PDF

88.4 KB Created: 2021-08-14 13:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f919979cf8700cdd5bd1d94268538593 SHA-1: 4e1d34997ccf3e5c7879e456c25ee6a459832ce3 SHA-256: a8cd268eab5fa01ad86804829c3cba18035b4a8b7b68881fd3233695a93579a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=ice+machine+not+working+samsung PDF link annotation
    • http://shinies.ru/img/lib/file/lekedurukivujilitajuwo.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/tozaw.pdfIn PDF document text
    • http://palami.by/images/file/pupazisigidun.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/tulujiruvuxukorudorivaju.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8a44182a4---65277400411.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5348a29db106cedf21d8d02715a299c9/sazanupabilupoxavopib.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d721c55aa9---bifinitinabu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cc18c808f2141afd97959160f427f3c0/22070276802.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/75872835474.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/7457212888.pdfIn PDF document text
    • http://raczcsalad.hu/files/94804961757.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/n50b3sj59mpov78mn5enc8j8uo/26741053340.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/11807056569.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/xatot.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vasbso2fpgs9t8o77j48mh49f0/gujimumodukireju.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/vejozirevajamilitane.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5e9cb79fk51cra7sebkjio6kc/26986559942.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/83467970234.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/67288762953.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/7947438348.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098430440a7e---94289647477.pdfIn PDF document text
    • http://sgpeo.pl/users//file/34912623135.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/gasafi.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/ziwinusewofa.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7c880f6b68c2c4d328ce193b0744c398/26784503323.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/65924564878.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b5f314616---52987422778.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_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 16452 bytes
SHA-256: a9d68e18a13c18797d5928d1f6fda78019bfcd518864733c2c8a03682c7ec653
font_01_sfnt_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 10860 bytes
SHA-256: f1f17ee4f4670c49753550deff674b299893bbc8ee7362e3478ee7baee482149
font_02_sfnt_off00013b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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