Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d87e7462c3a6bbc…

MALICIOUS

PDF

81.9 KB Created: 2021-06-23 06:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 783ecc16e2b16e792adfa991d5b6ac83 SHA-1: 1ab9fcf793ebb7cd00fecffe06446d0064de6485 SHA-256: 7d87e7462c3a6bbc7d426880b5494fb7371701b4f32bc6e50807a8986e6b7fbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=hello+neighbor+alpha+4+pc+download PDF link annotation
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/9239a255ad893b14063edc2a10e17217/20413058714.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7f307a8b5796c93566a0802f1e142bbd/28790005057.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/99930197767.pdfIn PDF document text
    • https://partner-support.net/user_data/userfiles/files/niwabemigunavijosuwav.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/94583898329.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089688561f88---jewuxes.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/mazuma.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/70077543393.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/53443912266.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c78435e1b31---gudonatagurewowaw.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608102a686144---25522987935.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/gb6q963pq4ppo7ae34sngpamf5/98790124292.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160994e27364de---wegotavuxijefis.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b979bcca326eb0b1b894727be55c719b/wixiruwakejajatikig.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/gozatuzaderubepeka.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c43298565fd---10796426740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 5436 bytes
SHA-256: bcdc1f300509f58ea190c80d56373f5e40ea7d9f27b714e935c5067b5def4726
font_01_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 3432 bytes
SHA-256: d685c00155c134b27e8f082538a538712c98c72c71e8b02b784056f71a5a8287
font_02_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 10652 bytes
SHA-256: a55978dc51ac01d09bbe8cfb279c7663e6b89db2f7bb086988d98fe02f8ded7e
font_03_sfnt_off00012479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 16320 bytes
SHA-256: 07e964fee191359f65d7059408c9169142cb48a3743e4c79cf7ab98f0fd8ed45