Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84b8e23b75a3ea6…

MALICIOUS

PDF

106.4 KB Created: 2021-08-06 13:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 20b010bfafe43d78d65d260c339a9784 SHA-1: dc1c182e43ca7c43f0b18880b31a16e71a6c3890 SHA-256: a84b8e23b75a3ea6645acc76ee9dc83ca5ad38dde79782130b142f345c07dcbd
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f0e7d76c0af8ee87de1f002d8302aafb/9370195397.pdf In PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/bifafezaxokiriju.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/xojodobutim.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/9874533621.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f512c2a93281926d07043774dfd27211/lujebakumejigefo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcfd4927f0---68699446221.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/52750169485.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/nunonilemix.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/30466193815.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qpvufua76efha49oajjd71d5q3/96827084828.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/raziwadarunamavos.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/guzebadudumanuwevudofuge.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ad0c407a9---mezefutinomofavalage.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/vunilovoluguzaluwelobokas.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ba0bs7omvmlb97levpraa3dt14/taruwibakuvemowimuxonuxe.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/0c1739a996b41eb74041804e062574a5/4069953301.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956a0b60d32---145158137.pdfIn PDF document text
    • http://beateromer.com/bilder/file/14690717020.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/610bdd93ddd36d983b2a11592ccc16f7/rimofixorugofonejo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3cf5ea1e0d0b65f941ca1dea7899380c/58386682625.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdddbb02b0a---lojaretibedezobu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa7e3c9d2---gopemera.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/82e9badb2c3272471a0a534b29676e0e/36134140806.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/92034844309.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021072812180673499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+espresso+tutorial+githubPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 10892 bytes
SHA-256: 36127083822ef9c8d8ead5a7007a8f2195a0f22d44ec6a4b8c65e34a6122474b
font_01_sfnt_off00013ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD8 16344 bytes
SHA-256: 756b691c13b983eafa03e47aa9f0b6ad58d5b72d5a208688d70894321573a878
font_02_sfnt_off000150ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FF 18220 bytes
SHA-256: 2b21dd448d63d42a08b223a8659d9f8a0d2267ce91c670fe2e94bf3f344c6fcb
font_03_sfnt_off000181b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1