Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1fc0bc097505e9…

MALICIOUS

PDF

98.6 KB Created: 2021-06-13 07:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e21f2a255db40f6fef3ad90a4715261b SHA-1: a032c02cbe2554a11a52e2e36745e751abf91430 SHA-256: fd1fc0bc097505e918e7cc67111b45dc15eeade68c79b65f6789309cd0aea589
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 0.9994

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://queure.ru/uplcv?utm_term=pizza+simulator+characters PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55be032847---92160292025.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607649aca82c6---18015219486.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef3e25806---68180854423.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/kuxipevoxoxal.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791bdeb0648---82233719785.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd1421253c---mepofixumifofepeg.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/14991819825.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file/%5C/2021050106324836.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/debezexenuwukisifovi.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/renuvuzibidikejakome.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/de0337824b88987617ac52dca8578b87/75217284534.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ttf81rjjp4qu0tfqn52ilcftk3/kinumajexojezikerevu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/7jcu0vfdo6h7e98i6ob4lfgpas/77444437247.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/8080816708.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/32302084463.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 3036 bytes
SHA-256: 902b06ea5777fc0ae3f1cef5ffdcb8b2cc5155172d2677e8a293daca66f97f5e
font_01_sfnt_off00011f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 4868 bytes
SHA-256: f470efdc5a6093041c55f282efbd12ba3e2a3a1a7b165b0ac52fe9b32fbb934e
font_02_sfnt_off00013003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 12832 bytes
SHA-256: 5e2ebf175b72b6f5c3b384007e94b4c969c4455930c4a4a0b840964da0061db3
font_03_sfnt_off0001593f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593F 16220 bytes
SHA-256: 840be1fb8096d7d10d86638be320fff2446c7105775555333ba1929aedade268
font_04_sfnt_off00016ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e