Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1c4d0b313dccf0…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 02:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eec81416c6453ba5096089d8f72e2024 SHA-1: 6e20f4d175e9eb55dfb522753dee713e9b9a9bd0 SHA-256: 7f1c4d0b313dccf0416d74dd4504bc201111d3f62fd2ed159e2cfae3d26bf9c1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=comprehension+worksheet+for+grade+5+with+answers PDF link annotation
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/aa869db74b17a024201de36c00a910c1/60946978792.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/fagivokokerejipugodakenov.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/73599246070.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e4785b6f1---68947981057.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2dc7c1bb9b34d315fc5e3b30140da11a/61068206916.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/jirewudajoti.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883aca3b30d---togazesusazibazesejak.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/vomavoda.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/92158404727.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/0hpu6cs07p9559b6ns0m1pd2fq/bofotemakodolewo.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/daxofimebotazetosu.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/48582820662.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbbb9366271a66be94ed6111e0a35020/67678291125.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/fitoxewura.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/748s3c5crp7kgt3kebdbd6us04/41756075750.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125641e950c0---19333257980.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a02caf06725---biritotawimogilavu.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/80846773657.pdfIn PDF document text
    • https://yellowstonewildlife.com/38477238465.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/bowupomet.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c43a297ea1ec32c729a358a516a50bed/4335166265.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/16969199031.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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 17916 bytes
SHA-256: ccb485f56d552d61f2da63b4d73d0c2e4e62bdafbda5ce72b7be433f6135b9c1
font_01_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 11244 bytes
SHA-256: ddecb45a21d756dbc6628b38edf6c264873942e967a8e14164ec11106d8e9658
font_02_sfnt_off00012407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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