Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4eb0a074a37ee8…

MALICIOUS

PDF

100.6 KB Created: 2021-07-20 02:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c0136c173e3b2ffe0562b8106862699 SHA-1: 3cd8284cdee5dbd61dca4a433b9b5466eec99311 SHA-256: 4f4eb0a074a37ee836c206cef6e43c15d18f363a2dc8a4a7bdab74b6114520f7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb74c159265---22938663860.pdf In PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/debodepe.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0f60e4659---69488927092.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/mijerazumelurebawifi.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/vukuxajivegop.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/1601679986.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/84bec3008f3a3f9ba2a144b7c481d1e4/wefalawodagezu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709b937ea8d---44570565209.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f63469db25---95021496065.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/28625868783.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee454c7ac55---69475315652.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd761f0b66---71012100522.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ul2s6d7a2gtkosft0uhfbbot67/29977665170.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/bj1jvi4124kk02go31b0rftqj6/kuvodetewewitovopenok.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/8ktrm2tnghg2dmu6rhkl7d99k7/45242771494.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/rerutof.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac9a7a30b---renexif.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7d05c9bdb711a5146c4fbde59fb0b363/geziguzojupegegof.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb94cd5072---86331252262.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/69197471128.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3f0c34aa---35415358891.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1262497eab94cac8887115050730b8cc/zosoj.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac648be8af5---nepigidutesuzu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb0f7045a8---71449397757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=investigatory+project+in+chemistry+for+class+12+on+soaps+and+detergentsPDF 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_off000120a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A4 18388 bytes
SHA-256: 9d415d10bfc58f2b6f208cfb2effcd279b045e14ca24aeebd4b9c640da92e070
font_01_sfnt_off0001514f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514F 11500 bytes
SHA-256: 55f6bfb202198ba794f46c24f15bb6e1d10a27828643e84c7d93a79597ce0195
font_02_sfnt_off00016c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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