Malicious PDF — malware analysis report

Static analysis result for SHA-256 817593a2550736bf…

MALICIOUS

PDF

95.7 KB Created: 2021-08-04 04:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b667ee9d32dc3f94e70ec3448f7d8323 SHA-1: 2af7ec5bba79252bb77e2050c47e51cc4ac32a3a SHA-256: 817593a2550736bffa2c6c1eb1258e0947973a8abca216ebe3cb9df67918d64f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these compromised sites to host or link to malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59b995575---54805641029.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a11f0fe1---jabokimajajake.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949c7678741---20314583122.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/20478503464.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/roripajejutukagitopu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c96f75140ef---58960705036.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e673ad75fb---lenowesunupajesur.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/e1ert61kuqdun34liai8dimhdb/70930956656.pdfIn PDF document text
    • http://tfforming.ru/d/files/jurami.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/gedalafitotudotujuxefo.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/p6r4uq7do02tt1gspd28vvuoah/13504957495.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609af00ca4efb---futezurulusuladame.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/posup.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/suruvinusu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739f5b9578e---39857941802.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/donaxagoruguboroxo.pdfIn PDF document text
    • https://tcremich.lu/files/files/43835531597.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/06b9ae31f33acfda61b8d1c4c9e0cfe4/28233767757.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6d1a29e391---dezeribopogiki.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/f0itjtp5vq8uhirt6ikq2ne5or/nitisutinira.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/88375709042.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47a3ccea27---80359194209.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/18d1db7acf1207c8e1661935b14302ac/44752367698.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/wofaxuxedezuxenizarivi.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/84djpbb3sktak9apndsi97d4up/49016120338.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/9598101657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mapa+de+sudamerica+con+division+politica+sin+nombresPDF 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_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 10972 bytes
SHA-256: 9b1e4a50587a79858b34e5ec4bed7be2eda2c87b7a72a9bc13dd721e1762ee60
font_01_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 19428 bytes
SHA-256: 847dd16e80115761ad9cdcd3dd0bd1f19beb425afb050a42f51af2b4e1ebe0c4
font_02_sfnt_off00015583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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