Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b4af161373b805…

MALICIOUS

PDF

163.2 KB Created: 2021-08-12 15:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0dcc033b355f1b7f6c5a3c3acbb213e2 SHA-1: e3323c6b8871c720ce3d8bbe1f4a2049e2748513 SHA-256: e4b4af161373b805a26f834c09dd00bcd77eb59823c530de0c01391938ca4f3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://thaoduocvn.com/userfiles/image/file/jolosiwozilivelixe.pdf In PDF document text
    • https://discovercefalu.com/_data/images/file/ripikekunowegipaw.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/wimadil.pdfIn PDF document text
    • https://ntc-container.com/upload/files/sajupumojofupogeza.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2358e3dd---sukularepu.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/bojexoloxatako.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/89053597490.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe04c1aa3---wilerawewitav.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/3575218593.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c747150114---22943437781.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/94aaa3f8789b8871a647828f4c07e5f6/jafubawi.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4c26f1543---21578560971.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/69477543926.pdfIn PDF document text
    • http://mega.kz/media/upload/files/87970192482.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/63649580777.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/oc8ma3m5fvrguj79ciosd1p7vg/49762785117.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/50ae5bb7f9d9bdc364ce24e77499bd5d/15239875882.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/6jtnpvjgf5olsk4gh38ug0ccq5/japedafamolomasemo.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0d7060e875323be8c35a1ee227722536/38272241038.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/36105378834.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d444cba7f7---poxusakudegokika.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b610b79ba9b---mazolezij.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/498d807f836c789506ab62989ab76cf1/68337628448.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/rupukitiwowomuko.pdfIn PDF document text
    • http://gojjang.com/uploads/files/12657604942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=audi+a3+sportback+2020+dimensionsPDF 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_off000217af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217AF 11356 bytes
SHA-256: c6ac7a5e4f47605e2385013528562edcef30c975a5acbb942b5bb879bf02f715
font_01_sfnt_off00023254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A66 19616 bytes
SHA-256: 80d89b9397398c5619ca9dee0374ef6f09acc18e0ca02ac2666e27a625a97887