Malicious PDF — malware analysis report

Static analysis result for SHA-256 1892c0da7ba5cb7e…

MALICIOUS

PDF

84.2 KB Created: 2021-07-31 11:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 257808e593391c4a3ee0b46a985d6ac1 SHA-1: 10e757fdc160a07713538507c5221474cd51823d SHA-256: 1892c0da7ba5cb7eade738b6b3fc3370ac91dd909103f7f8120b07bea13ad92b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a redirection mechanism to deliver a secondary payload or phish for credentials. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074b6141e3ae---jukenuju.pdf In PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/87331305483.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101428de74f5---42220878350.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/10283300219.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a29de1c5a---95183736705.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ac5a4801a---17436367148.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9746a0783e---rudekuvevotabepilanam.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/8552313246.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/69222383830.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/76640153681.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de20e500d48---lujoxasov.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b0f9d30e8---mekilasosowixas.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210519054556_878494881.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/66048268985.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/798250006c599629cb0a9d0615c7e4b3/30943747926.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/87931041782.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/fuwujameb.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/19901680263.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/542b807b36468e873499d598b730f571/komipazafijisogulalub.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dbf229976---xozajiputedilav.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/39219379698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+test+insulation+resistance+using+meggerPDF 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_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 18040 bytes
SHA-256: c481ebe34232ad22525ee335d442bb34f4b52c9d5503002b62ecfe84b182372b
font_01_sfnt_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 10748 bytes
SHA-256: 65938dcb2d21c5f5322c3d3de60379ae2b844abe41d024a41739c7e57de9851d
font_02_sfnt_off00012b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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