Malicious PDF — malware analysis report

Static analysis result for SHA-256 842de12b34bef865…

MALICIOUS

PDF

169.8 KB Created: 2021-07-04 06:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1e09def77495c415a3e3e67a9268d3aa SHA-1: ea5006fc7bf389bb1ea5f4b4e806fba43776b70f SHA-256: 842de12b34bef8653f052d6bfbf60ee061a22890bd2adf2f64608d46f228fe68
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads. No scripts were extracted, but the structure itself is indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c994479fadf---vokagizexosu.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0a175f1d57051955f99ed7dc99c0d63d/36859417587.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/96448161263.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/22716304115.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/8d9a6c4a65b993443b5c8caab85fb1cb/48206767953.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/b6d18d43e6ed8f1f58d0e268e853393e/dozubuwofovumokexujeluw.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0e35dacc48dd1cd8821185f0720eff89/85758306344.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/9388615962.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d9e9d4f3---67083539711.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160adb1c77357c---20212469544.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b176e968c9---64830928771.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb5c3edd8---90942380401.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/luvozitiwibujukoje.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621005211.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bnqjaaiefihms7k0r2tidi66hj/93983721257.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2b67ca2ee2cd34335a5a57db0c62da23/54847255380.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/323f962f5d4160d87238caad0e58e164/25277532216.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/p73tipciu6q8mvglgl937ggcot/vudek.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/82447a35c30017a21675150d8353d013/xadulumoberuk.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0c5ac9d98b58c8617e6db2e4fde54d61/pubuvagilujibowifukusil.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4e1c8e43c1935024a08643523eae98d5/15922845479.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c113e583fd3---76630812796.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3f29ba41f---1004742358.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/bapodewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=noteworthy+to+mentionPDF 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_off00023ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000255ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255EF 17560 bytes
SHA-256: 6a131beae6220196b2d87b9af032d3454690b9963be0e83cc70803e326287181
font_02_sfnt_off000283a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x283A2 10172 bytes
SHA-256: ea5a92da1b2a5c90f185aef5b86295b98df48895c328fe4837c094b6a5b83d55

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