Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e4042ff88d927b…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 02:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0f6e6da395383171462cae8e5944547 SHA-1: acbe35c4d7185e4ad63049f9a00c8614e812e82e SHA-256: 11e4042ff88d927b3f334ac41dd88accc0019d8d665cc0e0da4013ae6f0d8841
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=equivalent+fractions+worksheets+with+answer+key PDF link annotation
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6a7100857bb649890e31063595e7ccc6/tizinoketul.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/bazatamone.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210627224818664903m1sko2.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/52509165121.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/fewigegaxi.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/22877289492.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/0bbd181c238f08ca7e2d1b65dba03baa/99270357879.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/65770211431.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161109cdca719b---xirekiwuv.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/41412223780.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501232207983786.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/dugovekidiwisofokamigowi.pdfIn PDF document text
    • http://funperm.ru/content/file/95503267129.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/92107112935.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/pinozonasisaziwalosuv.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c6d42091b646812f2a44d8755f2bb8c1/folididagixewekakipaj.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/kawoponusuxodigom.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1j59li5hinml55ct48415u4td7/zifutupinabutafumewano.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/5037377010.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/uvfq8q2rcdmb65r91ki1kas8r5/24973957559.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/dff517df80a1ab178347904484d91dee/sobipapelakudevofokopoj.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/3553188885.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/sodewadamiberago.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/80174980603.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ae119748a8fe2e2431d95f72489509dc/rujosozakid.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_off0000bd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 15664 bytes
SHA-256: 0ba0b62276df4be5b8e561699202f34b7c2adf1cf45d499ef90a00dc6bf908c5
font_02_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 11020 bytes
SHA-256: 8a688c8e8cfd52aee312e382b68e32d603eb6404b8d2cafb37fcdffce190afee

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