Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80bb4a35cf8c7c3…

MALICIOUS

PDF

92.6 KB Created: 2021-09-05 13:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c62c20123cc81ca93040009a8d3f03e SHA-1: 3d0b6531d0392b4437e8abe6504759b10937d94d SHA-256: d80bb4a35cf8c7c34ad2b75a9caf90621b0d6de92e9c56e77447a8edb8a05da7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://crewmak.ru/uplcv?utm_term=monthly+vocabulary+pdf+gradeup PDF link annotation
    • https://sahyadrisevasanstha.in/userfiles/file/7123859270.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608939bc70e56---sakaposawikevapalatox.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8a728d45---23105882104.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/8882029511.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/94939645695.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6816343eec19fde94e5433a0fe483e6b/47469831260.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/dinexer.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/nifafujapepazexo.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/55714930190.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/mexarapegebabusege.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/aa0de0c7dca3cef824889bf43882a092/nosunibepunewopepej.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608127d7220cc---zejusimaloraragonesemume.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7769feea993560697b26c6bff3272a94/zomomofepete.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/67051179756.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/loxabal.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776795bb219---65969044222.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b11a4028---fajigitewivevifenetu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ipgoq6up68cbu17qp4rq3j4ahc/xovuxobuwusateta.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080536296b43---87620429872.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b870fa950a---sejewosimal.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16111f02929e00---xopenaxemagilana.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c3574bbbdd71489bf8c0189e9da797a/pepul.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/vesigogigor.pdfIn PDF document text
    • http://khochailo.com/upload/ck/files/miwodilasatonum.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e907dca9e1---86566794532.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_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 17880 bytes
SHA-256: aee4cde00ed630f82836646763e9b2988eb0993cb53c36c567209ffd362f74b4
font_01_sfnt_off0001332e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332E 11052 bytes
SHA-256: 1a51530f5c5caf68859e71feb6482785b0122b239d5e13de9dbbf02ffbe63366
font_02_sfnt_off00014c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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