Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1cf699400dd091…

MALICIOUS

PDF

84.8 KB Created: 2021-07-14 09:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8e772d86b6d7b162cb0bfb4d593cc832 SHA-1: 0ffb464673cf19cf1f740caddd3ef830850838e4 SHA-256: 0f1cf699400dd09199ee74839b1f0c100e385b32ebe2c0e1a8f48eda323b7edf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing malware or conducting phishing attacks. No scripts were extracted, but the presence of numerous URLs points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=questionnaire+on+effectiveness+of+internet+advertising+on+consumer+behaviour PDF link annotation
    • http://omgmediatank.com/userfiles/files/95222299865.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/78527036898.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/49721220692.pdfIn PDF document text
    • https://biocoils.com/img/file/rigimubidemajuwomedol.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/u5kt162lp5kfdajv8r0qnt7k3m/dodogosomalufagejanopudax.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1688f5d7f095bfa9dbeef3d15392b5e3/85582214283.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/lk6tnt8pp75fnvignv6c0pma3k/bigulerudow.pdfIn PDF document text
    • https://menu2uplus.com/images/file/takanefadunavofewabatet.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/46111223118.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1c3bfcd22d70f468e277014104cdfa8e/wawimopaturelarazeg.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/lugulepunevavaz.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/wegevetuzetamazofenaz.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9b4878b3fc223d17ebc616b7bb589ca0/zuloxotadebetidol.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2426bc5b---kivamasegikenawimibisi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc227bae19---witetutiza.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/kabenorinopelufalolika.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075c40c520ca---filatilaxikatelewizotez.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/0bbc66dcef7318b3cda49cb4d4def3eb/bunog.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/e83oj9c96qi15b5ao1kabafjq3/bagofidepumenabusurux.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xinurigepozamukow.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/gudumeguvufi.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/i845s0uo29rf0338lmbqs9p7p5/fogoxasiridivuzujixube.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/35819168154.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/vegesomekelu.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/5831713005.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_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 17824 bytes
SHA-256: 8762c1f6097d0af6efa947b8d8c27d3c42b171686f714e8702be59af4836470b
font_02_sfnt_off00012aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEC 11244 bytes
SHA-256: 94807b37b0c10b686b41717b11d9609d793a71708cbb80b401aad511a63d9e30