Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c424f84a49c423c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 02:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 384e8953ad4f4f4c7c32542bb61cf3c5 SHA-1: d4eebfeb1e31f0a0edace27a4ec5e7614c923cb6 SHA-256: 9c424f84a49c423cd4c0a7e1900e8d7973e757615239eb25350e4fe703d97fe0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or redirection scheme. The presence of an IP address literal in a URI further supports this, as it bypasses domain reputation checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7c4b9a62---wogodilo.pdf In PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/e3ff93770243c9ca45fa303601028672/setikofavaginotoladuj.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/21079159171.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/12985774325.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/jusaxasofavoxikepiku.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607243d4aab79---mokolokumaxu.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/dulolajapoderefi.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/95679714822.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/dotisimowibinuwawuzemo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/aa4e990fb910705e6b90b824604c0076/depepititabapuwonaxup.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f2304215f---5388688482.pdfIn PDF document text
    • https://onlinendttraining.net/files/fijomojulumisebozibe.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a87b32beb41e03f54953c4127bc734b8/temetesupe.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/tuwalisawoboside.pdfPDF link annotation
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e192d94d09ade01c7cd31826fd9ac934/12762511975.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2150374032---mumini.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/65640535598.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/26313494442.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/dd45c4cfbf50ac10d32fcc03d191ac23/55510972426.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac8dba1c1---78361252163.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/25758283023.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/wonokoweniselumonoti.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ir0pllu7r3trq6am7vvntlo4a1/dirudela.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/58691629053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=blood+type+ab+diet+plan+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_off0000bd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6C 15624 bytes
SHA-256: d5ca04f5c83bc9236316789d5e091b735b361c68938fe182fde767ed890e0187
font_01_sfnt_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 10528 bytes
SHA-256: b94a09bc98b26339e1cb2afa5cce0b97b124a992f8ea8fb176f3e022ba56f0d7

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