Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6fd4759ba09be9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 10:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30975f8f16528f7ec0b9f3aa123282ef SHA-1: bc71dfe5200f11b384a58526fd6527598f213e87 SHA-256: 6b6fd4759ba09be9573903a8bc672c4c61a9bd9f3460ea16a8d3cba27e5b5951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bigxra.com/uploadfile/file/2021073122230873499.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947aac19261---rifeneduporipenoludar.pdfIn PDF document text
    • https://mashura.co/userfiles/files/88292272135.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/zudejam.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/45022583121.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/xosotuzivakosagurojado.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/70398978667.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/jldgm4a5g88ara5uafm6a0f9i4/pojazabubef.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47b898c718157eccd204f026cf26215c/sojizipaditijaranadi.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6b8c698be---51951184434.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc19c99d7---7148797662.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/64621751589.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/79523160164.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/porapal.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/duzuxowetiboramuzi.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/4509860956.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/28473040860f3e8187fb33.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///57956802260.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826e4d45e35---mamozosageginabepipap.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bd7344283cd8ac23ed806ccdd7d4cc8d/73377399611.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848e9352b23---vakex.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4e7dce5e31de4372680591dbbb879427/jojesidixorili.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b7674b6dd7---somimivutaxijire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=metabolismo+lento+y+acelerado+pdfPDF 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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 11028 bytes
SHA-256: 6b4ef1b4510e017e12b6b22b85687bf33ef17bf8bd67e9eaaa6f2c0af76cc4fd
font_02_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 17792 bytes
SHA-256: dddeec00fb3c6de530ad72a1b96022c39a8f106c3dd8cb70e392370b6957af14

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