Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af1d3abc7decb1e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 17:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f52312c25ca116f89088fb876a9aff3 SHA-1: a25c109e0b866dbece665bf1e7b302625cee8781 SHA-256: 1af1d3abc7decb1e4a45e8020fcb81a16ac4d35fd610a0d19148aad89463ab1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. The file's structure and URL patterns align with common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://listapp.in/ci/userfiles/files/40292237098.pdf In PDF document text
    • http://uralinteh.com/uploads/files/53045642281.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/fb46bffe00545dfbc9bb7d6c11eb6657/30983682581.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/pakejemedidap.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/vavijogatuxaxiwenigasi.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/12048713246.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/sorapemamefinub.pdfIn PDF document text
    • https://5uempat.com/contents/files/sogonobowaxopidolasubir.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/rudijokudolopurava.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aaef7457c---5161827660.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/xisifekazozopijurol.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/zozub.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103e1e95af7b---4319194536.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210626041643.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/127a78770866537dd53a90eb1d49396c/46953224586.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5bead517e---31690647555.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e30abe9518fe0046e3acc77c99e4ba8e/58914645631.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d58c98356---87203401457.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ad63467b---36760639490.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/gowuzojof.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/sudamoxuviwazaped.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/79038105574.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/70669395342.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/14836570980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=schematic+diagram+iphone+6+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_off0000b7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DF 11096 bytes
SHA-256: 660bd1eb3346a8fc03a14cec02735715bdfe142b3c0cbcdcfa70ead9e31a425c
font_01_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 17044 bytes
SHA-256: 417269e1a578398d5e46671e1ece5cb642e2a25609967966216e30f4404dd47c
font_02_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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