Malicious PDF — malware analysis report

Static analysis result for SHA-256 d035e259d2267066…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 10:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1358d67764dfb6169a79319be46ddf42 SHA-1: e26b5d7cc79b12050c39880e0277103b4342080e SHA-256: d035e259d226706670127b876eefdfe8119bf77498b6ae8169b254d384802faa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/7a63b66ab78c5ee755ce1c99f9a54640/61946662401.pdf In PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/95511366435.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89aa7ee288---55797829104.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/62193747685.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46dbf68b92---86567209268.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/o245tuoqskud47lasm516uve90/kogomixotukujovafanoziluw.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c39fbef870a8f579bc1591296a03cf71/badapaxoruweketuperate.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/580ca1fb4dd9381b49b377cf9e94856f/doguzunuzo.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/mexibatasajobegomoxo.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/3310fd530c49ce3d175f154fd42aaadc/vavadomipowulojete.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69e778de9---pitilisor.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/828ab507b3816b8bf967f26c1f2d9035/22283297836.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/34049781479.pdfIn PDF document text
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/rezunagujevenuzuvako.pdfIn PDF document text
    • http://rld-carbon.ru/file/vevikudonupu.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/zatitomiposutowupasaguf.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/752b57114b105dc19d188bbedf584259/77178559381.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a0f4a8e42e3b8a2f3a417920631707e8/36036375993.pdfIn PDF document text
    • http://osikovo.eu/webroot/img/content/files/lubab.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/wovuvasusale.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160808971dbeec---bivavesovelesiwedirobane.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/34345622766.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/35808317809.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021062821495676.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/lerowomifisukeruzom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=handbuch+samsung+galaxy+s8+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 17876 bytes
SHA-256: b235be78a764ee6bd25cde74460a2264d3cdca54ee6ef99b0776da2ae311d9b4
font_01_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 11180 bytes
SHA-256: 6d5307b1c1f19d808a74c73ab9cd028da5deb27d32f380abdf4483b897bff50c
font_02_sfnt_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 2084 bytes
SHA-256: 6226b9c4dc8be39f0615994ce667af6e8d4ce356ce9bb3455a8fc5444ca1f8f0
font_03_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1