Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80af11887efe141…

MALICIOUS

PDF

91.3 KB Created: 2021-07-02 00:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b272d74d57a26ac071fbfa42b3458435 SHA-1: 35a3237914d518f7e4bc98fb524c3a4e02990f81 SHA-256: a80af11887efe14199d615cbff97eeb0b828ce792531fb1aed5f26d043109691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content, likely via embedded JavaScript or by exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://bycongroup.com/UserFiles/file/tutofajozudubusosomesigaj.pdf In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2o6ir7dv2pm5ra834c9eh8qccb/61450865758.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d5c591afa---jugamiba.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098b779e82aa---pomujepobilav.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e215fadfa3---59405449540.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210604_6347BE27956E4781.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/78505169345.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87f219ca5c---resakemibinolegepatibofet.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/rejuvonabutunadof.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/6gmrh45c20kclndvo3t6gqrkfu/gufobevasavugupabipo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a26f45a41---91440194485.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2dd008f45---95871622793.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ec143024c200d186843261fe0a6b2352/84271029967.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4eb3934bfabd79be3b7f622fde282a98/tozamulawivitexiji.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc78a73ff7---jarobemovosofivix.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/kerupififa.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/72080989054.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0dkr2519iljjji7estf6otd2js/13579894265.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jhl3lkcd9tl97gb1dccg51gjv6/nofujufevew.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1c7d3380b---pumunesuxasuremavabujo.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/33865385292.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3783f9833b20440b82f2df8364e88783/90236175840.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a197e360de7---rixupizexime.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/8c0m5nl3eb9sbne8nagi3j8s42/5808065772.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/zadefefipibamanil.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/9234818937.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4fd89b8ee---gazupib.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a028209678cfa52f6ac2651f8f759e5f/jigawabibebelajexawemer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=iphone+group+facetimePDF 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_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 18616 bytes
SHA-256: 1487a8f03f329d0badd8cd58e2b21bc198ebaa27c8b3c67deca7be7b6425e7bb
font_01_sfnt_off00012d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A5 10764 bytes
SHA-256: 8c66b102f25da0c06188921b16d36dd89503e8c551f24011977aef7b050f148c

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