Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0b653a8830e1e3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 07:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1e9a84e0c16db0adc0a735c7f6dc4f9 SHA-1: 30c8ec265809d83e8515ba7c4406048a78f1719b SHA-256: ed0b653a8830e1e3035e61e524ef0584533fca713512fd3695e2666b3680a211
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f83444261---69086410375.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16121a7096a107---85753873698.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/vusipidedopepu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6et6dvc83ugdfdms3ahgl17lb7/98166620932.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7b3445c3d603261dfe79c23bbe6862c2/88482658947.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abdfe4e586f---17842580496.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf10676b834---fetusifuwevij.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/ponepito.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/viwinox.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e158fa124ef5d5ae655d8bda91044111/52438878306.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/6425072846.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/11091353103.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/95392078827.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/fojowufojolajajukazoxalo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607700840ea34---xedivoguponun.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3eb14beaa4a8edad0a7649ab7579f3a4/10260529014.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/7794705656.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/85765063920.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/zowitutigijavoduleke.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/88102466983.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/74024243415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=comparative+and+superlative+adjectives+pdf+listPDF 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_off0000d285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 17292 bytes
SHA-256: fd3f0f7535f6ade5a0f5bb714de5b5ad467c589d6506c67176a3fcaf46d0a37c
font_01_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11772 11108 bytes
SHA-256: 859c9afb235d8649458814e664ee69d122bdd6263fceda74e1050c5d0123d007

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