Malicious PDF — malware analysis report

Static analysis result for SHA-256 9533a6f9c3278a4c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-01 11:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b47e56075ef2d60e615a557206de97e8 SHA-1: 57f3efc0d6976829c66091a827e6c96015f64ee4 SHA-256: 9533a6f9c3278a4c36108e75d79c1b50286248e6c4e01995f39ec7133ba7ecc3
176 Risk Score

Malware Insights

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

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content hosted on these sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic firings strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad049c1290---60681984660.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160876e5b44474---87097471024.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/99173676566.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/32075614308.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd32df1005---jugamotus.pdfIn PDF document text
    • http://debden.org/userfiles/file/sadujedilosafuzujajewub.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/76823228800.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdca62d09c0---32654876434.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/70404494318.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16106c59782a39---zorukixaditakojugu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161176b0725b3e---bidimubaviz.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d25227ba56---45841974513.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/legedemifilarojineforiza.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/jinepamaf.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210811051015.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/89717319042.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/tetudimepusatalago.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/68015601387.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e5bd81de06iniugknrfbtmk32p/lerojaruw.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/sikiv.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081e422a5bfa---tuduxenidanufa.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710b2c0a73a---40214948547.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c47116e1933---63635590552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=garageband+apk+file+download+for+androidPDF 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_off0000b476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB476 10764 bytes
SHA-256: 1287811ff064f7e352104dc5ffc0e20e9a273ce36f5c5329870342bb1bf5806d
font_01_sfnt_off0000ccf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 14060 bytes
SHA-256: 1dc6a51cb17af043db4fdf82ad2eb1dfa3998f12cfa96edbe210327287da0ad9

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