Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3cd38d84e54674…

MALICIOUS

PDF

104.2 KB Created: 2021-07-14 04:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb3f4e66edb94a3d345882681a6b269e SHA-1: badbf96dd686a9e05d0cbb8c00f1e339121b24a8 SHA-256: 3c3cd38d84e54674d592283fa1296f476ceb393d728ec8a2f924697294560b2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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://crewmak.ru/uplcv?utm_term=identifying+controls+and+variables PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60134c6f9---13380061962.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7412331a84---mukejonofawunolujipakagi.pdfIn PDF document text
    • http://yuha.be/_files/file/59390210285.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gemux.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210625070804.pdfIn PDF document text
    • https://mcrlclient.com/ckfinder/userfiles/files/16955089590.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8r3junuu8pu1qqu83vnj3v1si4/depiwebetowozafukerag.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73fcb2588---kaberuxulopuvogumekuze.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/91176940730.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///lofimesafejajukagoro.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/319a72a0f4e249e07dd8f932390c25d6/sazagaso.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/84080916329.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/48284293793.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/95285278510.pdfIn PDF document text
    • http://tipiland.net/upload/file/47921101633.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/pakifitolav.pdfIn PDF document text
    • https://jcpcdesign.com/upload/ckfinder_temp/files/20210706095019.pdfIn PDF document text
    • http://benly-carson.com/product/files/22908399294.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a675b34f156---vojilesi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b186e2f015a---zezuxiguzilak.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/xemapexijuri.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9e68b69c477585039b9853604ebf9890/51160966505.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/45898283703.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/def7bc4f37909319c46d352281c0be16/54608261659.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ue8fkasbif1a5fcmv0l5g85km4/4468365509.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/moturulubitibuxigilan.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/63707070620.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 18460 bytes
SHA-256: f09ac39af0c9115b8de62b15b567e6e4b36dc40fdcec6fc33dd45834fedba40a
font_01_sfnt_off000146e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E5 17588 bytes
SHA-256: 7163f1ed4f614313e6e6548f71af2a24e197a7f00f2bf44021d9f9d43015af58
font_02_sfnt_off000161f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A0F 10920 bytes
SHA-256: 0909750690a10154b04eab873c99230e61d5765fe9176f31805895c74c205da4

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