Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db7e271a5665b7f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-01 03:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b77e3f9c328916609ec78ba9d800fc61 SHA-1: f0b8b41a3d37ed6f353086ac65ca719f26c0b66e SHA-256: 1db7e271a5665b7f6087f9fd33048b94ecf96d8040a8893354d1413ff90f4e06
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074b30cb18df---geboletupod.pdf In PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/di506qaf9t86c0gbp44mhhtr43/36154666420.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/zusizikapoz.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e26b0b09b---madiva.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/94d3984656a1f4ce6c157f4a5ac08eab/43227788883.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0829c7a675376f7f9bb5f7086fa76128/6527336982.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/33996997612.pdfIn PDF document text
    • https://projetovm.com/uploads/files/kojojefodexogi.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/siwogabud.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/61698113312.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/riramijusogenel.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/55677168828.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2538c19d180925d36b8651e94ae29e8e/9890935881.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb954eb3ca---mimixup.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5ac414a1---57950305831.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2e923249---21367123742.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/jovez.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210613134659.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/cif1u6giidv9dr8aodpisk7ev7/gajuvabojumibusus.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/duxesewesadinesitajane.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/11492695609.pdfIn PDF document text
    • http://webbuilders.com/files/file/40302744900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=oxford+street+directionsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c2ba67ce6d8106c80bae2f1dfb6f53fb/47914653147.pdfIn PDF document text
    • 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_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 10388 bytes
SHA-256: f679a59939a1004c117b9a3329a6f93d99dc3f1874ebb43dcbbdc153e1847800
font_01_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 18432 bytes
SHA-256: 8edfb05036dab05c0cdfc0dc4b0ad81a5c31b226c061c141dbe013a7a26158d4

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