Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5cfd1a2016ac30…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 01:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ed8692ee7c65a245a4d9202e516ddb8 SHA-1: fcadd390185785aff0ce8633b10fae618e5fc033 SHA-256: 1b5cfd1a2016ac30d2e324becdb89f3d6195989b18e4940a2b1837bb86aafb85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable hosting. This structure is characteristic of phishing or malware distribution campaigns, aiming to lure users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://jjinline.org/file_upload/file/tiwawusuvumupiwi.pdf In PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4d4e90ede102d74e11d013f18778b528/jetolevazomefeselawuvu.pdfIn PDF document text
    • http://k1a.ru/images/files/file/xumesefuviwaxaratam.pdfIn PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/tawoki.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/e88590592374391914d80bd59de70df7/xonabuxetusavej.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/zodozekumilunepazem.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/uvejuk5drnu1kgqf9buh492qs1/99225010676.pdfIn PDF document text
    • http://aimic.com/userfiles/file/72438544236.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/xopunufejenopewof.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef1a59873---vuxuwolerunefexurutevo.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ililvlr6m9m6ngj2u4e4hd9qmo/78392441784.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a241ba9412e---95411443740.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef8d89cf1---82194232500.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1bb9ee29abb2a6a0553a0850ce693c73/19520057475.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbcee61515---difuvotatukawaf.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/zolemodopaziw.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/9307844856.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/029d6083c318ee846785882743960c16/kekujubutiru.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a9206701e8639b03a098424a11ae1748/xuravibudoripiwosami.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/78130951719.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/gawepozujatepulezad.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/dozanu.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/96952101880.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/cbb07443c88bb98736ee4927474491d3/43593477724.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/35253489e78f81fcc48f1833074e148e/wakijafe.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/94335078151.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae5eeeed3b---duwup.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/7aa96b9a6d6db0f4196b77b238823f17/fimep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=flextherm+floor+heating+thermostat+manualPDF 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_off0000bc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC00 15308 bytes
SHA-256: fb99a1a71148d3840de12af0f65c5150ae24097a73193abd71f32218750da038
font_01_sfnt_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 10840 bytes
SHA-256: c87a79287e6223a1bff58ad931a6f9803a18103945b9be64ba8f50cfa014a47e
font_02_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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