Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09ea8def29e5f67…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 12:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d7a1abe9ca65c87adc9cdd81756893d SHA-1: 2210982365c9936c9c9ea0ccc27c97933fd67bc5 SHA-256: a09ea8def29e5f673d2d7f2e43fcd0605dc87aedd34b6ca8512d7df34f640dc4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself is heavily obfuscated, and the document body is unreadable, indicating a focus on embedding external resources rather than providing legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sharon-barron.com/userfiles/files/vudedutu.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/32c1348a43bf06c42fd241668364839e/88051685393.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0m616d9qa3cu2irubop46iisot/zozerosubafu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa1593ca54f4188edc3f9c5601eb7aa3/94253901030.pdfIn PDF document text
    • https://vientangluc.com/upload/files/povaxogexokusananepo.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/xolejenukogirawinaxut.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b990d2a238b---pevumuvawewekigovegasofol.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b188d25f857ace78f2ea824dd7e70843/podalimokupidafapepuxuped.pdfIn PDF document text
    • https://hsse.cl/files/lozit.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/xebojimidu.pdfIn PDF document text
    • http://clarasonic.com/upload/file/ririzezewixo.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/24635049506.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/156e6d1c518fc860f3d1bae81b3bdae5/744022763.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081846fc7aca---24301950792.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4355bb0a9d0b2bfb3e346e10d23789a3/1611506145.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210620032804.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/vejogetefutuzeterojizi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16098b33e7b56a---gokobowutugazupi.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/33362519880.pdfIn PDF document text
    • http://a-xian-coat.com/uploads//files/202108061214185451.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/41017638443.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/dazevozaledatozet.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/88435356773.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf90d4cda5---nopimuzilevonevoratomu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1984afa8f84bf008ea1deb0dddbbc70a/91546052411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=anandamela+pujabarshiki+pdfPDF 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_off0000d3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 21276 bytes
SHA-256: a995ce972409f0cb538cdae4e2a6a5d874cb886ce36ea647e1495a1bab31e42b
font_01_sfnt_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 10988 bytes
SHA-256: 724ced3457ac459b8b0c92fb62471a49bafe4a3f9c9f7a19af1b6b4987efb984
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1