Malicious PDF — malware analysis report

Static analysis result for SHA-256 0296a50c512f5fbd…

MALICIOUS

PDF

66.1 KB Created: 2021-05-24 16:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95dcc242f0ff7bf850bb1965a18bf486 SHA-1: b10798e100e9e2432aed20e8c3a49433067d4201 SHA-256: 0296a50c512f5fbd587b2054340e8cae7be9bbec72f6421158f0948988efd06e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/71e33de7df20bfbfd6ce0c185528ad5f/41355373495.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918f1629008---sixirapapowi.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1d525f5c5aa4f68e2e34dbb3535742b3/nojusatagisawaleg.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e0ec2d9ebcc48bc153880b94e1e5f730/bupukefedafuwak.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f86277362---58572327657.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/54038c8ed9d04925f7db7ff1d83a237f/54294171015.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0adrh8fbeokh7euibcj51rqfh2/nixejiki.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-11/20210511031316961186.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843e7a06aec---47158924360.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/180795dc228f31e04a354b8a02fa3950/74470266637.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609300dceb65c---79864172856.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d8889a3faafa90c487b1460fb843f324/nowegowi.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606da141c7299---muvarabeloxufosojoj.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/444f6aebca4393294c28082e85ea11e5/98620721228.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871e0bb3b3---44356850280.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fbb577170a757092e3e60bcf260caef5/30174465794.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608324b003349---gigapujowazigivuvume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=candide+overture+score+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c74e.bin
5345c86ec61988ccfcf06848caeb62c4de9c61e93b8c660ac104efcc420fdb30
pdf-font-stream PDF embedded font (sfnt) at offset 0xC74E 5080 bytes
font_01_sfnt_off0000d8ad.bin
dbf0a0fc98ae88655448556ffb7cb3f5c72369af0229efcf713466e1677f8c02
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 10208 bytes