Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be982cf4a1ad9e7…

MALICIOUS

PDF

70.0 KB Created: 2021-09-06 16:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f1fb318e84fa406d45013a6818f2374 SHA-1: 224d9b2dd7f3008263e91d67c94af1bd54040045 SHA-256: 1be982cf4a1ad9e7b50d6cefd6784df83fffbc59ef19065a11617d61c582f0bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to obscure the final destination. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23f8321dd---11574464065.pdf In PDF document text
    • http://muacuoi.vn/Pictures/files/26901658801.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/pepaj.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b45c4a30889322797fb2b7b79b88c91b/ragexefis.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160940fb0cd926---gugigonubesifor.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd6d571c7f---89419298900.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/jixexezoturo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4e45d383---tunizevukama.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/lubexepixatuxevifeni.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/vikuzirilakaparonevez.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a54d33bba8e---9250786949.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a77d762aad---lumamowikumabuti.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/nelosiniwililagamevem.pdfIn PDF document text
    • http://slsnn.ru/content/file/65336825011.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/54030007638.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c032bfef7---tivemazetuziburib.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/12842773691.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5835edd4d---koxori.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131679c86e9f---40482355840.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/zunukiwupofudikoki.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/xigagugogovubepedalozo.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/kawelojajepowumigojeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sistem+digestif+adalah+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_off0000b309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB309 10696 bytes
SHA-256: 123fbf754f2f4f4b1949d0de4e43ecd8ceac261192b6b1cdf302ec2e075a4ec3
font_01_sfnt_off0000cb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB56 15792 bytes
SHA-256: b95ee7b93ac9d4d8789b3d48378d380a6146c50c5473fd8bf9a6b512f54b7e9e
font_02_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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