Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fcdb6cdbcd093a…

MALICIOUS

PDF

91.0 KB Created: 2021-06-26 22:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1293ee7aa190d482c15e2e5a457c6c79 SHA-1: 374705599bdd34b74262dbb2fc530b04d3925745 SHA-256: 83fcdb6cdbcd093a51e8b05eed02660c799e394a03bc568190e888f4c79f2dd8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=frederick+w+taylor+is+known+as PDF link annotation
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/f5c9bce80856bf19c29fd93eeba360e6/50259337187.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/af3e9dcabb915f6c6cfea8473a5c49cb/fuwaxojowugajurekibanudo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c4008b103---gexarasogelurolewotinif.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/gutokowu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bf65bf72c---85040265162.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210519182114.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/207d880a5b11eaa0b1ef8030ff4a4d6d/20776663733.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/t21rh3o3oojifj7v81ljvl5607/49572731250.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/35227fb7bdb05fb72eec85e86063adc6/titokeguxifaruzak.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9783670ff621d868dfe775cb6444bd43/98465060473.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/tetokodojevarazu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810829bb558---51428831311.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/fijodimofo.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/26663943660.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d400fa32---pedepepus.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5a6e793ba3542845e2d7b44e2b572763/kijopepis.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/kowebowomexazipatabe.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8eec94ecf310d28e78aac0b0be57461f/81756749743.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c60f8aa1c5f---98504403834.pdfPDF link annotation
    • http://mitcostruttori.it/userfiles/files/zobagojarekafupej.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/8fd4762d508b4942c9a6701cbb32b0ea/dozuv.pdfIn PDF document text
    • http://tai-group.com/upload/files/noxaxifafifuvawewawi.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/samefawub.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/56688801681.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_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 10632 bytes
SHA-256: 3cd22b66151ee07f71958f7c466c3cd3fd2382dbc9fcd10efef1260680a12574
font_01_sfnt_off000117e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF6 17248 bytes
SHA-256: effad6ef96188aa3951cec5eb844e711959dd25ba60dbea83e0500a2fb14f06c

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