Malicious PDF — malware analysis report

Static analysis result for SHA-256 4083e8a2105d19fd…

MALICIOUS

PDF

125.4 KB Created: 2021-07-04 14:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ca8c4036bc63fcf0851cf65e2f2e008d SHA-1: 2aa8aec38cdd82854cb74b8b05ea7583bb72d143 SHA-256: 4083e8a2105d19fd1d5161d606831631aa61be7a2bb5a4dfd407a45b89addabd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9161

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 http://lalinpress.com/ckfinder/userfiles/files/47071646238.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d70a699b370798650d759d4f19d4427a/6268183769.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071293b3cd0b---2862950433.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/97bd88cc25f8c6fd12d9901bf4f818b6/74642800380.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bnm040pest9tpr1oq091s5kkb6/zujekeparogab.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/63849250263.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/57682215949.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/jisilemunowogesubuli.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/demisufikupuvexidumasiru.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/82502430108.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/60j1ffivnourak15a6p1gqsi2g/gupamufuxaduzewufolupet.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/59107610573.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d9295c505ac---48311463684.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/93ce14c0b1c1775e94b2083f6b063949/bazotujuzizakuvo.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/tobipuvuzerotegusot.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a7d2f090---39995852948.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/15621172084.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/65bbbf15d170a8eefc481aeb693e6472/79606627967.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7a797a7fcb4e453264823206de033b18/38220836601.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/70895876722.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/43309812760.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01b5c068d---mefibukuwobu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b69d73a0---tafofixutewizemobega.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609faf389de59---20719330535.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/dasuwunafatijebe.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/zepopevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vadose+water+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB2 20720 bytes
SHA-256: 3facb3451eb4e4cab5743ba4a8ef5d341ee4114a9e12f7181bc3686b918453aa
font_01_sfnt_off0001933f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1933F 10600 bytes
SHA-256: ac8efceaba5ecaff72402dd32d2961b5afd79eb0639179f82bbdda5f0c49d76f
font_02_sfnt_off0001ab46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB46 16608 bytes
SHA-256: 5cec1fc7c38b7759641f1583d26ffd54f90d840f2adc0977119ed6f7858c8088
font_03_sfnt_off0001c29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C29C 2592 bytes
SHA-256: ce532919d8a07a3d72da9bb45ebdcdbab9cc2c339af10ec524a86e5f84440a09
font_04_sfnt_off0001cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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