Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b18adbddde9476…

MALICIOUS

PDF

90.1 KB Created: 2021-07-05 07:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 346ae3aa7d7ddd23e8d5243d799627f7 SHA-1: 7ec4c13b752ec768b61c04e189eacbcda93a5900 SHA-256: 07b18adbddde94763b38d23e0cda998f9da572a6dbae42c2a9f1b0a4e745e6d1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://bititechnika.com/uploads/file/57424930493.pdf In PDF document text
    • http://bajcsidavidfoto.com/_user/file/54282712225.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/daefd6a420c79ddbce1a4159fc7d0ba0/7089958070.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/pupafen.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/dc4ad172561385b1d73fa4e8e5df1dca/91180301409.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e97890eea73dbefb19ee5bfd46e3ced5/6825312073.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/37110745689.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839038269f8---wijetemijixod.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/65028391386.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/43b5cf0dfac82845565a84d035081d37/6184626184.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/93881360785.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/deludavitafokigejob.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cabd3eeae---82279489104.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c694ad9df---wuxowugewaromonebo.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/lelakowipifodigo.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/kufupos.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/14229496053.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/op6v6fh33rivph1gafk9bqvc40/gudaluvuwumuwapajiwitotus.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/ropopazozaseduj.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/19495357553.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccec598067---buladupodadawiduzab.pdfIn PDF document text
    • https://educhina.mn/editor/files/jarikafoxekoweti.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/1642308657.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7e99a63e---29944772689.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607621cd39c04---runitakaxenusijejes.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/k52aenpi57191ihvqbrdtfs63u/54769216426.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/desapemibiropakolozej.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ce1285e8717fcdfa9ad8d3eb5e436029/77124974952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ways+to+describe+peoplePDF 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_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 10652 bytes
SHA-256: 3d8898a12a9066c341071b804b4abfde65a4a8859b9e4ee72f56213955a79070
font_01_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 16992 bytes
SHA-256: 80512183d94699aeeb2b3f59978672c9f419a37e5cbfc1da9b26b2fa2fecc17b
font_02_sfnt_off000142fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1