Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab27dbd6039f05ee…

MALICIOUS

PDF

69.8 KB Created: 2021-06-01 13:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 822a60a27174d0dbc3b0ff16c3125675 SHA-1: ae775ef1de29ac77d19115505c243f8945c895d6 SHA-256: ab27dbd6039f05ee7df76485de20d9538b2bfbc0edf564a55f3a384e8b5f505e
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=avast+antivirus+apk+download+uptodown PDF link annotation
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a1cf1724---23909312313.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/1068391749.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b00ecc0f---subugawiwufudejewolod.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1e4357a0b05184ccd9cb8052e4d304aa/13593298001.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983fca89277---73262109283.pdfIn PDF document text
    • https://securitydm.com/slicice/file/3965113784.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/acf7b46f87c82530fba98bfba3653f6d/ledimotigiz.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/687d43993a39ee96c46fc4dcc92022e2/ralamutidoku.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/tavitijalitisum.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/91241629243.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160991ca8e64e1---waweluvosipumasum.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/521t058srrd703g85ik3tdqcb1/mediwumafopebipetunupode.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/jalutepifogu.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/momaniv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 5156 bytes
SHA-256: 3f64f6310dd81694f5e15abd6f927f131da17b9c6a132d20c018cb59fffcc2c2
font_01_sfnt_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 10984 bytes
SHA-256: aad2f7c14571bfdca5770fa5c81fa8090e8407468094df72b212f6a24382f38c

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