Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceac77f2215b759f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 20:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b442eb88f1d60df1f7bbef99efb424d6 SHA-1: 4722336aaa4bc3055d1ad00b07264ad0bbff5dc8 SHA-256: ceac77f2215b759ffe9d4d9626b34afa45e952ce51f9c0f559358cb589ed053d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. These links likely serve as a lure to download further malicious content, such as other PDFs or executables.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161344c4155cc4---lotazoku.pdf In PDF document text
    • http://uran-berlin.com/userfiles/file/8479743978.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebbc204666---49006720206.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/37736075407.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/23711819456.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/25203236210.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/xajadukenivogumarusitoxe.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/jorolavetobixibumunajel.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210910054350.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/76313215233.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/wusogugipijupapimasedumus.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/92816135250.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/27647521697.pdfIn PDF document text
    • https://nls.vn/upload/files/zigewodunotopazosimodude.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/mefigejofumutaxotiru.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/83261899189.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/verosabajajavekago.pdfIn PDF document text
    • https://atlantidegattico.it/file/tikojozezum.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/1840460990.pdfIn PDF document text
    • https://menu2uplus.com/images/file/gapeguko.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109060051369423.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/10042492977.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139de1451e77---gigizon.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/zijoxurinoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+football+manager+2019+apkPDF 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_off0000b455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 17984 bytes
SHA-256: dba39b6e960e1a9dac941dde70588711151284ba6e97e41add05c595c8b8cd1e
font_01_sfnt_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 11364 bytes
SHA-256: bbe319a569c0a5c99bc3ad2fd80178d5d3f2e66786dc7dcc946f1a7020071647
font_02_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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