Malicious PDF — malware analysis report

Static analysis result for SHA-256 e194b4089061eb73…

MALICIOUS

PDF

88.6 KB Created: 2021-08-01 04:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9308a78ad1b8a47d9de9037ab63ccb1e SHA-1: 1be2a9e379eb2e56724a20cd50aee86d836d28a9 SHA-256: e194b4089061eb736141e38c84a940916cb0b5dc4b0a37192395bf3d7197d99a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/d68f236ae922dcf95c728a2967edef67/79684331253.pdf In PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/5spsg43d82p5r8kcobf4lq24bg/28376543786.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/7501870458.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/25849660654.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/93535a906065f985e07436306b0bc47e/gusefelafawet.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7dd6d863a---mexijo.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/59105387236.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3cse3ovi0j4cd38k6deq66oj75/16226653884.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/35391348212.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab18dca6cb9---lavigexik.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/64337166168.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d3405491c---70625249882.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6f3d86f93b7c7584ec362150cf1de2b1/bemamolukivovoxawemov.pdfIn PDF document text
    • https://ikima.fr/uploads/file/vajukagaluzelu.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/dumapepagixu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe566b990---83915082200.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/pijamexadama.pdfIn PDF document text
    • https://marosme.ro/hirek/file/roworelowegebe.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7906421f3d---15184068656.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf55d13bb9---kedelubokiwezum.pdfIn PDF document text
    • http://midel.me/userfiles/file/barudolaned.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cacacdfb7b---37068368197.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/95537731447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+are+the+steps+of+deductive+methodPDF 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_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 16860 bytes
SHA-256: 35e3de8aefb3b4cc3f44a0f64e50981c019aac1795a6769920c9eaa672b6780c
font_01_sfnt_off00012155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 10896 bytes
SHA-256: 4f57a8d0d0e9790244af094aa9d11efd9aeeb251ffca2c0f66faf0ab08575ee6
font_02_sfnt_off00013a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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