Malicious PDF — malware analysis report

Static analysis result for SHA-256 91783138f8e7f7a0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 22:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c12a94e8949736dd1162f24a21a4a9e4 SHA-1: 044071286de10e7c2b4322909da9750bb9e430c3 SHA-256: 91783138f8e7f7a08f00b360f67b65afc0c6969d4bfb475ab1be7190ff954f4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/35729619b747e4e5387611edc1b35a7a/28210949810.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8a1lis4sj8brevnr8ctdiursp5/soxukelunerexugafufet.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/9mhnm753ohbua7q5tqjkiq3rgu/dijagodu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9bec89a3a---79433477604.pdfIn PDF document text
    • http://www.moyekolodin.com/files/50482251762.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f684241c1d5---vaxozamen.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/76775967706.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/41615020156.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e7f8a9124281ff0e36a9ffdebfba0185/mekijowabikatifoxile.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/gm43cu1u9u8988j0ht5v5vn1b0/19647829418.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e41f505fd1---mowidewixosivuj.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/51239313922.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/8592796376.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kubegoxere.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/jewut.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/laxedado.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/78678271222.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/93156259165.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/judaw.pdfIn PDF document text
    • http://unseretochter.com/images/file/51167064566.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/82744436890.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7041a889---88042484927.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4425574f3b88e64218219bb36870ab9f/mizozirupoluj.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf5ef8b89a---86732617785.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/fetuwi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f808443423---75490877735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=add+text+into+pdf+filePDF 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_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 10144 bytes
SHA-256: f7ed2a99e6b42121a36ac2527dbbcd82c20d2caf9408b6d75948fc1bb32e0155
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 17776 bytes
SHA-256: 79f138bb2c4a488a734433fe23de76d38075f9e71c42af5b2bfefbb5cdb0f78b

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