Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb92fb68e43c55b…

MALICIOUS

PDF

106.4 KB Created: 2021-07-29 18:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b14c61b24504f47094806b0b40abb862 SHA-1: b0ac6dc608414f21d10fcad9eb3766af6e45f2b7 SHA-256: fbb92fb68e43c55bf0e3270adfc5bd730a59baf746490e5ac0981cedd91cff4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ae61fbd0252---55347249321.pdf In PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/d72a915a481e904108c2bc32bfd4d086/92377099839.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160741c1f2ead8---62953058565.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/dedudanebidutasowesibadu.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/57515707067.pdfIn PDF document text
    • http://imbirimbir.ru/files/62608587454.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/174facb3b37224191878b808301db87a/madaloduwax.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/09cd73cb8f6a8f9b9c1229ecef21505e/52287253289.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e37e37c331444b9b6cf31dbce053a148/govigusubawufi.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/sixepazeluxatunelana.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b252b2ceb---76806008773.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b85da21703c---51057252163.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b679b0d0ff8---rotirebe.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f277ee70eb0cecbe6ca58a9aedd40bfd/suzajataselokasobulutim.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/48447607089.pdfIn PDF document text
    • http://enricobarraco.com/files/mivuxoxopubadozax.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/boloziwikitak.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a322a1126d5---45456965651.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3d4803b2ca6281e0cbe2860b7e280f1c/31581536548.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607278c24cf9e---48956430680.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c29b5205811---sorixinokufupeketoj.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090dfff467d7---nulowetupotosopiboj.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876d25ef73b---tuwogaboravos.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/nc0okso0lakc08ftca256rbbts/guwerogadazu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f29350c94ff90611b299995ae2349582/93405511321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=signs+and+symptoms+of+an+acute+abdomenPDF 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_off00013b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B06 17964 bytes
SHA-256: a1b62dd2fdefbee550d9f1728d4851ad84ffca81d4bdba832fc0ca1482bea188
font_01_sfnt_off0001690f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1690F 11244 bytes
SHA-256: 5c1fcbae18c30650ff2ec3f49945aebc5637e780ab5d8032585eae728279dd5c
font_02_sfnt_off0001830f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1830F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1