Malicious PDF — malware analysis report

Static analysis result for SHA-256 f564c4a5bf79cae3…

MALICIOUS

PDF

73.3 KB Created: 2021-06-20 22:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 008f1c9e599abae2b8b1b8526fcf622c SHA-1: 533b0ec585148bc148cafa6c31b473f1a1584f06 SHA-256: f564c4a5bf79cae37bf545ca1b2da360ce8d0de57227a92147279e094c7f0fce
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs point to suspicious domains, some of which are associated with WordPress plugin vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c7a09987980ce016a40b05dacbc7ff77/metisulinovifofav.pdf In PDF document text
    • http://aquatherm-graz.at/files/kubitutexemarifumutu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ca5a3f60c6340b0bc801577e240c3dae/33231583701.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b6d81c07---85105528329.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/52263251100.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/rq39sglsb7h79dsg85rl13d6jt/wopezaxebumebevemadel.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qt5lrhd68labr1svr35sdd5gi0/38648094102.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/mafira.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e2d4a8a28749844f5bad2ff6c78d1889/lasevomas.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/de49e7e956cc43ebf4a63192cbe72440/95700246934.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/deb73af99c1ee059d0966cab98dc3113/jeludopora.pdfIn PDF document text
    • https://vaynow.com/wp-content/plugins/super-forms/uploads/php/files/58de47c39020c2e87a691c9b5f70d3ba/40216888585.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/menujuni.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f497cecd---97959767918.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968fa50df7c---43178090595.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1342ee734c---fupuladuvofixuxibe.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/3fc5fu4eqpqlu5a00kral72l88/8404511110.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ec9dae517f4f17d8e508b1157de8b366/tovozawag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lightning+link+mod+apkPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 5104 bytes
SHA-256: eb8ba8cbe297038fbe823d0ed504193059d76f481a25d75a6222c7b2ac0d71cb
font_01_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 11932 bytes
SHA-256: 942b03485637c77cc35ec1e5879d40916485178704a8ff5d97dba6d48fee9c78