Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1dc71f98b590597…

MALICIOUS

PDF

71.6 KB Created: 2021-10-01 13:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 56419b33bc49785876cc2e6fefac6840 SHA-1: 97aeb642f878cd20eb105239856e42f2327c18db SHA-256: d1dc71f98b590597fd16275d8df71cc4bd1c1910a5cf3a1a393db0a3c71bd712
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

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 https://medvor.ru/uplcv?utm_term=garageband+studio+apk PDF link annotation
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/28574183321.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/80732539320.pdfIn PDF document text
    • http://elitacasa.it/images/file/jusuloju.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/rusenavolepaxesur.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/siwokoxofa.pdfIn PDF document text
    • http://ihdbd.org/upload/files/xudugarixebidaravo.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/fudujomebolasibetinukidef.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/96309585706.pdfIn PDF document text
    • http://schokozentrale.de/idata/badebi.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/firebekarewi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16155b1cf7e198---43409631031.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341d751b9ff---biluxe.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/68945606508.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/riwujoregijutenela.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/75803664561.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/88125788179.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145a6fa423ec---90713025071.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/82444a3a0fbafb0e944f8542f0ec3c76/lagapu.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/wutipetivagividujifijuji.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/vakonawasifutibufimakam.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/87979583296.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210917125920.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/41662889652.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/64476956208.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_off0000b353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 17488 bytes
SHA-256: 20f93b2c3dd10632f4a407ad77fa6c609f4a4cec50381d314689f6efc1630b23
font_02_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 10892 bytes
SHA-256: a9159bcefab3f7499b5ba5e9f47262d4f14d52d0c51fd29382eb8863d048f451

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