Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc329709dca8bec3…

MALICIOUS

PDF

76.4 KB Created: 2021-07-05 14:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: df1c56feec7e5a26ac087006cd2c8f57 SHA-1: 5f0acde96012d57b72a9551b032107284b781c72 SHA-256: bc329709dca8bec3b921e913be7d50980b1de99912d891d337cb5f2a0aabae05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing attempt, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://oilandgaswork.com/userfiles/file/63134172760.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4bf6bbda8---66164952422.pdfIn PDF document text
    • https://medtek.vn/storage/file/6680617658.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/eee8d21f605c5cb2bb15390fb51d9dbc/80330673859.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3mamr3i4jgtaug7motv5219cuv/61707874622.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2dfcbd11---80161961657.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9874badad---34092996206.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d9c8a806---82830293581.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b898b585209---90858517669.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/90997408386cb396c52061859f335d32/25759638213.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088beaea234d---zaferojidine.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/rapigememovolaxafo.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106150426581142.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/linexofaba.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/671c5fd044dcf29e08ab4b3c667b6959/7659304780.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c694ad9df---wuxowugewaromonebo.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/zemetafitumonozelinaj.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/gizeretoxirege.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5b1291c5c06e24a5c8e3ba155a861f58/pagejuluxawagavasixu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c81555917---pevebimoferokonata.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078ecf1b13af---3373502243.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/sefuburawosorubireb.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e09ea93a2---gamanoroji.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/fusexunivipe.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/9177137699.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/wamogevogunuzavenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+unforgettable+mp3+by+french+montanaPDF 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_off0000c5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B1 11420 bytes
SHA-256: b99f8d8b4ea870f5c04fa3045239cca3dd9dba69daf87a6a38299df51bdb591b
font_01_sfnt_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 16780 bytes
SHA-256: ca24dc8af6a279c85afd0112c926e84762799f332a8e8d89967b77df051053d5
font_02_sfnt_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1