Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08bcfe290abf7a4…

MALICIOUS

PDF

90.6 KB Created: 2021-09-22 12:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07961726b74edbdc545668a3d65919bf SHA-1: 2336898b51ff6ce529cd60e93730d5634c2147db SHA-256: f08bcfe290abf7a4646d1bed6d8116c7ede20cab2aae0244e588c20ec2a0a55d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=sword+art+online+for+android PDF link annotation
    • http://ctnphrae.com/ckfinder/userfiles/files/vegavijalugalijuvemagi.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/40081415044.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/75409743860.pdfIn PDF document text
    • http://royalgroup.at/tmp/59781941122.pdfIn PDF document text
    • https://2winit.com/Files/files/82214088344.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad3e687e0d---wanajovetobe.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/tufiwejuzivivujasusi.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/jarijememenugenev.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/fuhdi8925eb7kndsrprfctt8a9/wevuzimimowagug.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/punoxizexiwijezago.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6d5316c68b104ca58cdf9bd6b835067c/vizumidijojotibosologi.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/41964346839.pdfIn PDF document text
    • http://stylekd.ru/files/fenelinomizegerigulotuwi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/isd9vei9a7kbuit7irsfpu48m8/17059718333.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0kvalrhvsge1fskn6thhitgi13/wisobinepixusuzedil.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/59791382106.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161386afe85cc9---musawedejavo.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/fasigakubem.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/16878218208.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/wuzug.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/lojijowilo.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/pijid.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/4466298242.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b105576ee---bukafiradolotizusobib.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_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 17200 bytes
SHA-256: cb9d0d7849334130c5cfc8fb4dc1351059a24064ab0dcbcf94ab147dad094553
font_02_sfnt_off00014521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14521 10340 bytes
SHA-256: 4de2d6294c16592ccf0d251cb5bb9f0ac1fdaa183b90548fef3f39f672364de6

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