Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3258b0859d99c2f…

MALICIOUS

PDF

112.9 KB Created: 2021-07-30 20:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 657b89b2b770531f8c43afcc728cea7f SHA-1: 6bc35dee5dbac5f23fd6714ee01619c908c7cb3e SHA-256: a3258b0859d99c2f85ed03380062663bf7bf11d232f20678a57ff206583990fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifier indicated a high probability of maliciousness. Numerous external URIs were extracted, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=metric+conversion+worksheet+answer+key+earth+science+wilson PDF link annotation
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16097339baeeb7---jodugakanuz.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/67999087149.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/dna1unfovbrmcdapfenklpt41t/66304065309.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/mirisakamezixej.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/zomipiwawivobabekojabozu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe5ef29f1---33811601141.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607af85bacb77---pesisun.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/176k0vn6dii74r74d8hj3du43k/duvotu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c308b8982d0---62998717433.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/e92ngsoai92a6e07aud5m2okac/jenatuzoj.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5c4cbe6b758d58c6f5c9caeef1cf880d/tevakugatel.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/aa5a20f32f13e8cdbb744f4f904a1122/87546116766.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/bidimu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/cd7189a27e44bfdb13e2b0c261d68e12/70041271994.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ce19b5cd2ae4ad91d4f37062e0c99cc7/68277718065.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/19407673259.pdfIn PDF document text
    • https://udruga-invalida.hr/files/54358182250.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/aff5fc2214cb267821b470d5a0e17d4d/widenigumazinikes.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8d42902c---dezavisimarudinopanusema.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k9i5maugjbnogkk43pltp6tp67/nitonarozekatilorifota.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/pifizamesezukepopirukixiz.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/5455867868.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2a13c9b372363d82dd9ed5dfa461a93a/72759468150.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/10910613779.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3a6bc421---zamalolitivufoge.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/26fc6938e9674c4a731b3d6d4b54aabc/wufajejegadorubeki.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_off000154a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CBE 10680 bytes
SHA-256: 74818e9cf6cbd052e7c18f049d4236c37e8bec5de98aabd627f1d27a8790eccf
font_02_sfnt_off00018549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18549 17188 bytes
SHA-256: d1192c6e6ca7612fc103c3015beb377a82447b43a9f0edf7be53eed288692ccc

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