Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aca5939e9960e29…

MALICIOUS

PDF

83.2 KB Created: 2021-08-20 20:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1beb9774e8e80de1d6864eeb8562962 SHA-1: 55d38c9eb6fee39aac50eec12a1a6d26b264fee5 SHA-256: 4aca5939e9960e29f14fd86fe537a942f20c6ffa0c04502c4d0264e0efbbe5be
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations or raw IP addresses, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://debden.org/userfiles/file/paniwifogelu.pdf In PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/bexivo.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/pajajizejesebasovegutade.pdfIn PDF document text
    • http://amdind.com/userfiles/file/xabojiv.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/4mkh1r0nd6eapr1te8aqahu8l7/83528376449.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/forobewaxoter.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/kiwikatuzotifijekegolojej.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/kopuvaninorewavafusefazi.pdfIn PDF document text
    • http://poiskvod.ru/images/file/ropevuje.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jumomunuvetaze.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/niwam.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/fofez.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836d87b9175---80187313889.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7962a7bc02---55306531557.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfda87c4d---pitiforenizujefila.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/mafebovofuzewabuvinolok.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/ramud.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/zoroga.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aa04840194---76622282679.pdfPDF link annotation
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/44435034472.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/31177489846.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vldc027rpq60j1fvkd3fmq6jj7/63553030759.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/8436994501.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/37834134699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=binomio+al+cuadrado+con+fracciones+ejercicios+resueltosPDF 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_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 10920 bytes
SHA-256: 273ea65b6fe0d1b229691ea2657f5b3406e07f7d1791257dd59c4009efe14c6d
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 19164 bytes
SHA-256: ee42d0a075efbf50b224f87dd15f146e634b79f898fbd418cea61ac562248f20

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