Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d72aac1428dce2…

MALICIOUS

PDF

89.9 KB Created: 2021-08-18 05:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae6ae24ee911c4a4b2f39351066535bf SHA-1: f45b33e03abde0a103f87a726aed3435cb4240ea SHA-256: c3d72aac1428dce215097d52dd4907c554ca75bfc01e74a94d95a13061311158
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function of this document is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=markel+technical+communication+11th+edition+pdf PDF link annotation
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e9e3a00f8---puxenarubidega.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161156dc4b0851---76766248305.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/benisufixatepusuporez.pdfIn PDF document text
    • https://jotelek.hu/files/file/80119094278.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/q0o4l35hj9i86hlg782ot8cpq5/lavejamonezokoma.pdfIn PDF document text
    • http://citra.cl/userfiles/file/4469299127.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16077581f30763---jobetuvawelevisodewikisi.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/82212982108.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/49145429232.pdfIn PDF document text
    • http://rideco.hu/upload/file/90406651841.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/vibamudesemawati.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210517195342772754x2wwk7.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7b8eab674ee0cd533fa38d115ff97183/18429907632.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xokonabugi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ffbfcbc4551---vurebegijokafunirobo.pdfIn PDF document text
    • http://cutskytools.com/d/files/sedudukojawolonugutero.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/12885355184.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/34226713675.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/nagumavabemalava.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/xudagowule.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50c5c3d72c---39430333875.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e26348c90---7614427486.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/66a92f9d1f7441ec25f88913358f1cd6/dajafevebi.pdfIn PDF document text
    • http://leton.pl/userfiles/file/tepixifowano.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/jejamubidalevuj.pdfIn PDF document text
    • 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_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 17540 bytes
SHA-256: 2099e6f36c18513c3996b42c5d7d334cd684e32a88c33cbc328c9aa9b17e6af8
font_01_sfnt_off000126b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B7 10956 bytes
SHA-256: 84ec7ee84f18faeb5357fa6834146adb64ddc0129d553126d4813a7c8bb6e6e7
font_02_sfnt_off00013ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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