Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1c60c9ec713289…

MALICIOUS

PDF

101.7 KB Created: 2021-09-01 07:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 074450e0f8f769f360bfe89b2ca38cc5 SHA-1: 082588cbc35e01d15d7dc91b3469c58edd32cde4 SHA-256: 7a1c60c9ec713289ceb6ac96db907094c6432d63e75e6bcbb6eeb07ad282ad0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, including WordPress installations, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. No scripts were extracted, but the structure and URLs suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44df9ee120cd9cb38d4ec7303926d105/81907804446.pdf In PDF document text
    • http://dailitara.lt/bites/uploads/file/jibidu.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/sosukivewud.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/zulivubupo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39d2fa0ed3---lopadijesibebimodiwe.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/xawolejo.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/60574886454.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/17629751877.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/viwozejadefo.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/96668967615.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee35146c0d3---2601399784.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/liwiwiletasubibipam.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/wesuxizi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/69f63edabe2e6fa48d4d26f325e902ef/nenebajefewupipubowexan.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/sasawe.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/degebobil.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/49fkaofpfbeaqhdlg7nuqmnthc/zupikalirug.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/3d0dbcdec6f29d846ba306a2612d76c6/pamejodejaretoxegosadiw.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4b1e4a6a477cd005fb208a67ca12c8f4/labesakefepow.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b590798e---42943369516.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/pejuromolusano.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b253debea46---94832317115.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/sapigipuvomuramuwavupez.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ao0r90rf2fg9j4g5bpo20pl441/15311029981.pdfIn PDF document text
    • http://dd-eng.com/files/files/mupom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+little+fires+everywherePDF 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_off0001252c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 10720 bytes
SHA-256: 0ca32626156c83186c5e4d798679edfc4657797abb166ec5aceb5acb70e15c26
font_01_sfnt_off00013dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC6 18972 bytes
SHA-256: 86ba2d92790d3e519ddf8e5af30eff247e9b67c91f833190be08e1f8306f9249
font_02_sfnt_off00016fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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