Malicious PDF — malware analysis report

Static analysis result for SHA-256 61701c99ec9b2576…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 02:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0b19838c600601d298e00b589c1e4a3 SHA-1: 8b7d61ce2de1b7841b039f537ab0ef1f2b19978e SHA-256: 61701c99ec9b257690bb9ad65a249c935f6385d238a9e7c9c758b53dcdabec9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links to potentially compromised upload directories suggests a tactic to host and distribute malicious files or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05d42becd0---kijik.pdf In PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/jivofunadogutuw.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c2f6274a271---51038291260.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/m8h40r8dpi97m05lr5lct6vaa5/93800099613.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/68216145095.pdfIn PDF document text
    • https://bonacorsi.it/file/voxajuxafozofajosir.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f35c0b726---29948845165.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/83143939514.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/16623836763.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/88729396973.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160761e7003851---34242014601.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0udkpjda5seqjcbi44pkcsjis1/17068556327.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/95119609121.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/50068346504.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/042e3b545ce9024e5ac415d51daecae4/22882285417.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210611_AAADE49DD1ABB8FB.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/benasalo.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/51026283881.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071edf44bccf---fazoluxidenerivorap.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/srumnh147obh857dums6rresf2/17158961265.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/59211352043.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vpa1i8g8dbornseoj8vcgv2c27/65719999685.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a919da911---18432364933.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/68876248091.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/68280986200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=madina+ziyarat+guide+in+urdu+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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 10608 bytes
SHA-256: c460c3097b61992e9ac38e4d0c8ce1dc90639631c8121f5a276cf3d3862ca716
font_02_sfnt_off000109fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 18540 bytes
SHA-256: ddd5130a347b0071ed7e681a6aeacc8b4121b4d46ef3d1db880637cd73865d57

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