Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39788f87f6c4b35…

MALICIOUS

PDF

70.6 KB Created: 2021-07-13 21:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 312aee10bdf13ce847c04bbebd82f9aa SHA-1: 69a67508b0b9d53809777c6658488ecd725db693 SHA-256: b39788f87f6c4b35daeb82ad1791ee5acfd525044865abc32c80d80d2d9d775c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=li2co3+soluble+or+insoluble PDF link annotation
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e766f9f1---77909723233.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/kitoviruxedixi.pdfIn PDF document text
    • https://songhong.info/userfiles/file/tumalurovitufukimakofuzal.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f286f5cc72---vipopiniram.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-23/20210523012112365729.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1f787399c4400fa34c6761805cd1bd88/zobepepagito.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/iiq08lsp19ca7u32sco69b8dpa/65428841132.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/2e4435532cd34605afef55cd3f74d874/30866695778.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/niraxozimej.pdfIn PDF document text
    • https://kristinanamaste.eu/files/welovufajibosenizutevo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f87cf32f3---jewak.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/watufi.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/81013117952.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/7d7evge5v36caga51ng4anfvd8/xodine.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d947741f2ac---13320903975.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/75176403280.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/mudosizikilebonulebekavan.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/lodibirufufojuxujup.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/fapowedibabufamowaj.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/59365991213.pdfIn PDF document text
    • http://brukbet.com/user_images/file/menasazaxubudikuxaf.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/zivitibulebadakodenepan.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/melejavelijopuzo.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/99701300065.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/83216949857.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_off0000b51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 10452 bytes
SHA-256: 37d30c851f5a1994f5c5a4875be720c1a181bbba55a396e28eaf64c84c269d9a
font_01_sfnt_off0000ccff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFF 15712 bytes
SHA-256: 498058e7a2ad57564afb34a5bb41b0c1691ed21c2ccb839a70c6b3e6ef61567f
font_02_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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