Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41988cbb00702b3…

MALICIOUS

PDF

100.9 KB Created: 2021-07-14 00:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ac097941dcf8910f26a2e75b9aa2434 SHA-1: 74b5ae79d4ecc4ecb4651afc656349a40a0ea32a SHA-256: b41988cbb00702b3be4ce63b640c33fee300a2f1c5c55df1f640bdf141a20186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddee0967be---gusiku.pdf In PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad72efb62b4fab93ea7f89cd8663fe80/35080998236.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/348eerbj49dtgnvi7r2e9qoha8/xekejawatujirag.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/9b1b30a18b4749ceea798adb5c302177/wunofiwolefijimo.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608346165dd41---50724409142.pdfIn PDF document text
    • https://daismene.it/file/24741940558.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/rezite.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607188afb9f17---66018617196.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/59333142117.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ucgl8bvk4foh51nc45ujc2lfg5/9629413264.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/lkmdm97aqv5206e21t0j0igsj5/dusapesagajasofamofimijo.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/41850695549.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8c0d7dcb7dcabfd9b0d596853d56b881/42663312572.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/edblh7634dn730l3gde09ck2ss/40716888301.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/wokekijideliw.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/rikorakujolaxekibexikig.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/katularomofomajad.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d19dbf18---dejidasupujexemuvejepok.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/bevamijeruniwevonupitug.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f9e124fe5cee30d4d7df0cc4742e30e3/ruwubavopiregebediboberif.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8282b0c68d---gipivimemokapuzatagu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b258e8f278---59326118674.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ht13ttdd0t02mujkivottu6rpo/55833525047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vba+activate+workbook+by+filenamePDF 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_off00011195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 10796 bytes
SHA-256: 4853427e1eb1de36aadf8dafdb55d65a072ab552cb8e48286d1f98da4caa892c
font_01_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A9 17380 bytes
SHA-256: 4836a7b8c0a736fea9f7337aa3626c4f5332ffe6176611f5118d9bc49b6c2c08
font_03_sfnt_off0001705e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1705E 16236 bytes
SHA-256: 9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40

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