Malicious PDF — malware analysis report

Static analysis result for SHA-256 e842bc65ab5302c1…

MALICIOUS

PDF

104.0 KB Created: 2021-07-24 07:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d28890c0733a902d3fa22c387de99e16 SHA-1: bce9fbb786df414e6e3fa5145c5e6d970b4915d2 SHA-256: e842bc65ab5302c1e6a70d03a3f8afbed441c9e02bb8b64dd6f75c48548bb95d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. These links appear to form a link farm, likely intended to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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
  • 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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842424ca95d---38379165101.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed158b07d8---nukofoxita.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/cb0871c5b645dea290eb4bea611e06fd/vifefexasajisem.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e96a72628b3a68d918992d87bc65f0d3/7178245825.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/poxisafimut.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/kibetorixefapulozos.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f53b9242e519b24dcf13560f0c9aec7c/popajufo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc788c16bb---sarikojemeranofa.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/fuvezitubalejit.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210515201923.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/0thkqd4emb0s77n84h7d8u779e/23399277034.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f03dc7ad3bc---vogir.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/remuwufesozunoxabuxadero.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/62255342080.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/10177afb71b70f67aa4f67175bfee821/pagulajojumobuziza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adba1772895---83705036613.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/zafavebewome.pdfIn PDF document text
    • http://biomehl.com/images/content/files/nunawexaborugezobipu.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/39934495811.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/86cfaab9edc3543b481000bd84b44174/pixibezilutuzuwebimufozi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e7f59842---93765648441.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3e4488b3d203bdb5a3db39b452a962a9/16755871519.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/86545228808.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b748b45c1c3---mawovivuwigumajavewufed.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/64735156572.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ced05564f---fupuwufaxatukub.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/68582215769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=evanescence+fallen+zip+vkPDF 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_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 10356 bytes
SHA-256: 4a7c79112fb0fee2b8dad22a436722651f01b28cf50a7387fee2ca8a19388d8e
font_01_sfnt_off00014330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14330 19816 bytes
SHA-256: 26f90fae65229859ab494d89ea689e908611e52d01be63202a1b3d0cc6c1e3c9
font_02_sfnt_off00017791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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