Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b397d9b3179d8f4…

MALICIOUS

PDF

86.7 KB Created: 2021-07-07 13:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7282ceace03c32cec554a2eac7d93f9c SHA-1: 4d5b6ad05a6041a76cd1758d154e43e5345a37ab SHA-256: 3b397d9b3179d8f4140d0d14aa2d85f3c36359f16796421066da6cad4b766780
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://nanumed.ro/uploads/files/12783501875.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eff1d4318---29126308240.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb8481f01---94131383540.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9jhakj2cug4ejdaec8dm2n6oqo/kubinejepuximuselugafur.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r9s8fu652k28diq8hokdsc5lh7/lilevisemug.pdfIn PDF document text
    • https://giustofiori.it/file/funafotozisufekukepedu.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sejetisaruf.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d1b0a0f9a---dajebazilonog.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dafa1cc5e34233d8e7951a92eb20822f/44717673632.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796e1f84b5e---53940584310.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/kogamuv.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/disabo.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/bunoveketuximalijomude.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210518013844.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/82182765324.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a3928cd7---72275453089.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/f6qbiuph5nslimhtgluf4mnl62/38197121468.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/bexiruzurujifub.pdfIn PDF document text
    • http://crediramasrl.it/public/file/22022196955.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/446d4a3400eaa3d870ff48a338b258d8/13026862677.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babb137a909---47912939145.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/98450228698.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b11c1f16bb81eaf35cdc74bbb138d66f/13871144713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+is+an+algorithmPDF 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_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 16576 bytes
SHA-256: a08d6a8b63a7dde416d36056d7821321135df32a7f3b608e53e9be0d6b1f90c0
font_02_sfnt_off00013530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13530 10416 bytes
SHA-256: fe8deceb5ed82a17029056db7d3605ecb3ace3f9dd23cff0d83dbc6cfc18e0bd

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