Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a75718efaa843f9…

MALICIOUS

PDF

92.2 KB Created: 2021-08-04 11:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d101d45ae6fbced1d4ba25ef3565411 SHA-1: 24da214837c9c1e745d729546ae036bc8693cb85 SHA-256: 0a75718efaa843f9a13e7d9b9ecf1daf4d771ed9f893d6d7c532ee8f261fb8db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains embedded JavaScript and numerous links pointing to compromised websites, suggesting an intent to redirect users to malicious content. The presence of a link farm on disposable hosting further supports a malicious purpose, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/27795046719.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607dc36c22bba---26329435913.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/peret.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/nisozodirezi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9d7ede65---tonuvazunaza.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8627173a1---godawag.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c98983b463---wogenopevulogazudogefede.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1a4a49112878a2ed470515cbcb0143f5/98521895778.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/tuxami.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/xolezomikemunezilezobu.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/majopagiba.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/41302294137.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/4457348306.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1d3a94a1d45a3f4218c1c2f1603d7393/67807444076.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/86466575805.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/rapufokedunesiw.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160810ea657582---lutavizumu.pdfIn PDF document text
    • https://latework.cz/soubory/79904661001.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0c5e00f8---47561075125.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01ec86459---mubukov.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a63dab8f6b---76652012277.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/185091a87649e7269ba7e148b335b19c/9402672121.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/ab71b7b6fbe712f6f71fd5bb65d8d1b8/97828792013.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/17389795139.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7fdf16d88---misusem.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b19c0f1fd27caf39948958c965efb0e8/dabosesosojef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=peter+drucker+entrepreneurship+pdfPDF 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_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 10584 bytes
SHA-256: 26a9e343fefe69884a704e7d379c72348a0a7fd1b33028982aa04986332f2de4
font_01_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 17788 bytes
SHA-256: c607ac2fdf306971e0a547ee45df6301b0bef2a0c5fe6597232971eb5bdff2ba
font_02_sfnt_off00014943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.