Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adc95fbe0606d98…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 23:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1998f847612df204a0868577aacb0f7 SHA-1: 2e5ebd7426968a0423942fea625999836a66b051 SHA-256: 1adc95fbe0606d9899411f34dd27b902058ebb5cce2cfce696b5bf50d047b845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm on compromised CMS uploads suggests an attempt to obscure the true destination or leverage trusted domains for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed0a73820---velukuvusoz.pdf In PDF document text
    • https://centrorevisionimonregalese.it/file/jemav.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/kuxetilujukedapufewuv.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/fijojagogim.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/bokulivaduzul.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/41523576859.pdfIn PDF document text
    • http://beta-rc.com/upload/files/53129887211.pdfIn PDF document text
    • https://granitnet.hu/editor_up/fefaker.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/makufixigurowa.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/93051802369.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab4ca5b40---3840554161.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/maxilerupiguwiv.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5b40a615---kanipunalutazol.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f1622ffd33c9220c5ae028d5f80ef7b7/47775732592.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/19453417711.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/95515270503.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/xasexadajodokexagebelunoz.pdfIn PDF document text
    • https://mihalex.by/files/files/66385548917.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/bokilulemevujufuje.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/67693228421.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/32986655637.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/36903909141.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/ximof.pdfIn PDF document text
    • https://flyags.com/editorResources/file///dudem.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161376dfd48cd9---32241024167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+best+ever+game+by+gurugamerPDF 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_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 19236 bytes
SHA-256: 8e61ec0c82fe659f08b8c4aa5ff02978f77e224562af34df44a6895866ecf2f2
font_02_sfnt_off00012adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 10824 bytes
SHA-256: cc45cb6d7edc2b076b1124b43d5ab0d663285d978f85a41073d01b09bb77f235

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