Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3fbe4c082e29a9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 13:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9441ff830679096f5469b50828619c27 SHA-1: 19ac65dcd6d0cf506326a63d129b2df9f6cabf77 SHA-256: 8b3fbe4c082e29a92906b14d98e216fb57fd38edf2a2bc58ce42d82637e8c976
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to a variety of websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=romeo+and+juliet+character+graphic+organizer+pdf PDF link annotation
    • https://watfordfairtrade.org/app/webroot/img/files/78680355796.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/banikozadibevowulipef.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/kenixesenuxobanu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nebilexegosazuzelinenewav.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d7679658c34f9a539a14204ab451b10e/luwodapabi.pdfIn PDF document text
    • http://yuhongzg.com/d/files/28847299643.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/woxewerozokodu.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/45739773928.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/17844646027.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/tijitujofegakivusinufu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39cd3608d9fedbdb923ea86b313f144b/65127889490.pdfIn PDF document text
    • http://mopron.ru/upload/files/50323090601.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/94372834651.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/13284246743.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879d88c8f79---wanoviwuduk.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa8fec9ca---dujemupulojovabirigi.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/psjjuelc252mq0dni12q5qoqfc/sumexikawepatomonodaf.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/58882157829.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/3115142558.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/27258922082.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737beb9c966---butunesawekupedafaxidika.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3b7fe40e7e918d3fc185fc02e7f7f05b/miwagubame.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4a351f3b---pulififabaxuma.pdfIn PDF document text
    • http://askort.pl/Upload/file/rasofukas.pdfIn PDF document text
    • https://dm288.rs/slicice/file/46082155574.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_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 11232 bytes
SHA-256: cfb9f69a31954c596a46c616ed68c7e0132d2e047539cc9f8fb25e6775867a99
font_01_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 17048 bytes
SHA-256: bdc18161d68af5d2ac78679994c421c055fc0b478b442a786c5ad54bb24e7ed8
font_02_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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