Malicious PDF — malware analysis report

Static analysis result for SHA-256 2885412136417496…

MALICIOUS

PDF

85.7 KB Created: 2021-08-20 19:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5758d58387f412af2524f2a4def6703e SHA-1: a40ded4bf44c5490de6ef318b3afcd8c77b0d79d SHA-256: 28854121364174968d6149ae44220664b4f04331b9546e48ae999553555d46e5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous external links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pieseautocomenzi.ro/userfiles/file/fovagojogapexalulovatifos.pdf In PDF document text
    • http://pierrevillers.fr/mairie_files/file/gebunigakiwapaliwip.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/615275595.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/70655581065.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/89023523374.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c63c5d0e6---dosopuzurikaziwodil.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/sofoviputuzagonomileti.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/50609669113.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/nakewekowolunelini.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/30877168825.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/62832671813.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/22424796644.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/74930246844.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/92061048734.pdfIn PDF document text
    • http://texmet.pl/userimages/file/topatokixod.pdfIn PDF document text
    • https://seerupit.dk/assens/file/xomoralifakivazij.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/69386148289.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/180413017635.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e7888532bdb---81030752696.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/67727056657.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/votedogulojarijez.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/73157266172.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2se04bitbfil8c77mqcgq910hv/36495070179.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f6cac534---64051285964.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d1fa10b9---85629209380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=teorias+clasicas+del+pensamiento+administrativoPDF 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_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10704 bytes
SHA-256: 56ce9b6d354121fa906d7bb88e5ebed515f227615223e50d70f7ca85b519689b
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 17896 bytes
SHA-256: 43f06fc0f380a34ece264193608419baa7ff5b8aa8d3e5183af496126c267242