Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd77b22a250c8f7…

MALICIOUS

PDF

82.1 KB Created: 2021-07-16 21:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b4a54bd837d1724f90cc17562b2c408 SHA-1: 764ed8a0fac510fccbe5fcdbac376ce62a3be3ef SHA-256: 7cd77b22a250c8f7d351de5a8ade5d7272906b16ee380cfaee4b5d052a4255b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://redondoclassicburger.com/uploads/files/61936999725.pdf In PDF document text
    • http://barudan.hk/UploadFile/file/20210622010618399.pdfIn PDF document text
    • https://songhong.info/userfiles/file/rixaxafejiza.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1498e131f---nuwinesazafalowetaluvemis.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092265193156---vojejipirifimadul.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/vemizefamigokunegopufonam.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/13774575997.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/rexelujamamisupixitefeno.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2abafeeb84c3816916380416382649f6/22873635622.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72b0b4abc4---84048668322.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/60140211471.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/m9ia7ahmpfmk2c765fb5k58mt1/pulipufakoxaru.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/nosajizebuvanupelas.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/3b0614fc6ebf73d8fcc5cb08c69cafca/92029160730.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/658ee6adb052b535720a7dbf70f986e4/kuriduxesavunexuz.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/59613895447.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baefd4fa3d---94003460065.pdfIn PDF document text
    • https://nada70.org/userfiles/file/22771930223.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/lutapodalovukazibebe.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ltvfh1gtes00pjetg7uut3472c/33417307126.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1ff4f158b---kinetufolunelijiroxi.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/0qp5puvg62v3719rlgvmftj5oi/dufojo.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607024f548692---worujimam.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/nodeji.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/13282582320.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16081db436964f---48472425293.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/38335237249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nand+gate+definitionPDF 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_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 10192 bytes
SHA-256: 161fc7f278783f66ec04f7d7a72d8748f29fc136cc0bdb18aff0327df10bcff0
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 18396 bytes
SHA-256: b9c9b452e64f6736996e43358d8be56b5fabb975cb4d905a61a7f0a69d553d29

Open this report in the interactive analyzer, or submit your own file for analysis.