Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f91dba2d7042d5…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 14:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff222c9b534e571bf16fa7fdcc215c26 SHA-1: bbd4d56cb68631c51f9906a5bb24014c4c822b8c SHA-256: 99f91dba2d7042d55b7ab58639df47077838bf1c92bd80bc2e36d465a33dc803
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous other PDF files hosted on compromised websites. These linked files are likely designed to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://manenshop.com/upload/files/nelaveru.pdf In PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/a99387aafe4d8d6118e825a599d34e39/15155434103.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/10422910672.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/66204777833.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/6d7cf375a338980861e69db31902b4c0/38614576264.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608007f38c2df---1961505553.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a566b8de84226ab4454b889b59b2c9ef/sanumejadijosobefe.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/81445336891.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f94c4e5597---wasonadipifozozutivesidub.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d45c792e---migosatedusejuluropu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f25c7d6a7---zesijezixowawugokemuj.pdfIn PDF document text
    • http://geose.ru/userfiles/file/wuxusuwo.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/13570612158.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/32541223348.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8b4434b5b85bb3fc43c60e9d2c48b1b6/panikora.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/66174077242.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e89ee3a813a---17949092448.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1625007122.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/jaxusatosabuvopapus.pdfIn PDF document text
    • http://dzbnf.com/upload/file///99841120936.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/16257070171727148999.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/baf3c78d4d63b4212bc547ef5435b8b4/24581567384.pdfIn PDF document text
    • https://marigabung.com/contents//files/68508190073.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e9061b5ffd8---migoxumafafekelume.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1b4af5c7483ad3c8044b96b54eb6e09b/65158247621.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/69062865614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cambridge+igcse+business+studies+4th+edition+answers+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_off0000c11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 11456 bytes
SHA-256: d3185e47b03503dc680095f60977d38b2bde03987503e50c9c352a92e80a6d7f
font_02_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 16908 bytes
SHA-256: c834d73ffb43d10b99a5e983b826d688e51e36623992cd86615687b526819bdf

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