Malicious PDF — malware analysis report

Static analysis result for SHA-256 de92d7e1d0f078ba…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 14:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76f90f83e3f4a0ce9bcf0d76fe7f31a5 SHA-1: 28d344bd6f0ccf1286cdbf4f79467ac44070f69a SHA-256: de92d7e1d0f078ba993ff11a31209d5196f63151a7dfcb106b2c6b20ed75e172
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple PDFs hosted on compromised WordPress sites. The presence of numerous unknown URLs associated with these compromised sites strongly suggests a phishing or scam attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.cenlaenvironmental.com/siteuploads/editorimg/file/97315682931.pdf In PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608758769eadc---86099957300.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/tifakomodofelo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c137eaab6---tolulexutezewemuxu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c939e3b2d1---5793936706.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096c60145f11---gowepapibotomekujax.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf730c8d5---62442416462.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8893d316b7---sirif.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/kezuwiganitid.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a9fad0e180563c63bda3f156a5f8bcac/zikinopakirajamugu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0f56ad4a9e51c05e42ddc6f2c64ddfea/52038470486.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3d5ed1bd9---30839129065.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210617_C6DEEFA0102A0B27.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/vsr59d0ah3hgiq75jp2emhbden/votikeg.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/milevi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/nvqn71g6qk920k8uuoc69roo41/rezarop.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6bc34639---10330976168.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/8tfe51813blfkd1lo61giarl83/vidodutorugokafadov.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee920967ca---rumenagulidorijigavu.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/61261866197.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f065637f---jadasibopigaxibekidepas.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91d2a6dfc31986a32cec08177fc85b9b/20674844699.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210523220845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=journal+of+plant+science+and+phytopathology+impact+factorPDF 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_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 18380 bytes
SHA-256: 49b56f1b1bff83f7a6afd3869a007f568ffc15e36db09c9a247099ceb31a271a
font_01_sfnt_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 11272 bytes
SHA-256: cb91b22c790b9d4659acf40160de5838d06cee81dbdba790bb55e527ac7b8e8c
font_02_sfnt_off000136a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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