Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a33f9d27f4243a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 21:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1dacbe5a3acfd478a36677587b87893b SHA-1: 26292c4acfff03cbd9e8c14b298e2b5e327e3fbd SHA-256: 07a33f9d27f4243a7aae9aa6926480e3b6bd6834cad51b2f83516e945b931880
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm on disposable hosting, with multiple URLs pointing to PDF files, suggesting a lure for users to download malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.agenbenangbandung.net/file/nekukerisatudereval.pdf In PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/janibafibagizelat.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1aea7cd3---pakisumodutikiferasesatud.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/kijubezovigutu.pdfIn PDF document text
    • http://denge.aero/upload/files/garip.pdfIn PDF document text
    • https://synersys.fr/contenu/file/mezonarumonakovigunat.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/97fa71238d0face81f0433c8be712eb5/farurugabazebudinoxajol.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/sefugudegitukonamawug.pdfIn PDF document text
    • http://hoachattn.com/image/files/41154402779.pdfIn PDF document text
    • http://hbaoge.com/upload/files/86767485324.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40863701853.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/jojeteginituwipubogabarik.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ac30394fd0fd3174efcbc934af4861a/kexoxo.pdfIn PDF document text
    • https://austarpharma.com/upload/files/bosemejupovegodejaza.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/porar.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/55455663682.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/zinifanomerapelolulo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/23879707542.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/gufetipobi.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/74776420499.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/kotavuzirez.pdfIn PDF document text
    • http://cycling-software.com/files/file/gegagi.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/pilomawesexuxoxep.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/nurutamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=zombie+smash+android+downloadPDF 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_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 18300 bytes
SHA-256: 45dbec3f1268d0a99d00150bfbbf2e0830ae7ca235d36610353158965c285754
font_01_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 10604 bytes
SHA-256: 2ff4634aefbca59d69865c2085ec9618b90e92274321bdfdf57e4a7e3664ec8f
font_02_sfnt_off00012a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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