Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd4e05ea3927718…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 17:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 522a919bf19b4d73bd79d2f38dcf31cb SHA-1: e6424d9fbdb146e49c9a464286fce9ddb6d7fd3f SHA-256: 9cd4e05ea39277188c95dcdf91cafd4af98825cfd6dc3143df0b58e3c36c564f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL analysis point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sabunwangi.com/contents/files/mukekowunudog.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613368a794046---wopitarifotejon.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202196145783668.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/28028316538.pdfIn PDF document text
    • http://taociren.com/upload/file/21090807283507200215pct0wy9j70.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/dulifin.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tewomasonupejepa.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/notoxudilegofoxexita.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8b15e1b6bff0b54a91f1c7da3d5ec0fb/fivitixupuzizulafonuboja.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/vusemimawopakoxowoperot.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/65198927042.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/sujurevajozotitodododosel.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/93759479525.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/puwanabazazuzo.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/mazilikoditinefibez.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/28186184087.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/rizamoxoximawafakume.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/57230513254.pdfIn PDF document text
    • http://newworldss.com/uploads/file/kugimemujexasebus.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/79712327352.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/6059845996.pdfIn PDF document text
    • http://gestioniarmatoriali.it/subuvugefejamemi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135e56d2b270---boxefirisotibifoz.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m1r4407fmft5na0tif3ev9rs96/zijazudusaduwevejeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=engineering+mechanics+dynamics+7th+edition+solutions+pdfPDF 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_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 11316 bytes
SHA-256: 5210926d0494ef75052c6d75c74741382f7cd77fd17546a499b7817e8e7c7333
font_01_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 17940 bytes
SHA-256: f05e82afa92b22b390b9ad55198b1d9ed2d379652e0512a99eabd3515bae825e
font_02_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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