Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac358f15b04b40e…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 19:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5fe1603c13e774c1b383e4e43cc5ef89 SHA-1: 07534550f79e7cf3dbc4b7d124ecf7c4a8d5646d SHA-256: 7ac358f15b04b40eab67417098a7435d56ccc8453f1b16fd840addd3d64bceb4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, including those hosted on WordPress upload storage. The presence of numerous unknown URLs suggests a broad distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fuzoku-kyujin.jp/ckfinder/userfiles/files/41220813274.pdf In PDF document text
    • http://ajtoablakcentrum.com/_user/file/94043834153.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/51046418368.pdfIn PDF document text
    • https://guijek.com/userfiles/file/43508218159.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa99a6eb25---27747251260.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/jotina.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/3975052371.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/57734786121.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161349532d2bc6---dagudulerezepowit.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/mupesokevipumibebagamedux.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/18813198514.pdfIn PDF document text
    • http://megalaserasia.com/upload///rafeguzozatozanojugup.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///26783320955.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/52402487228.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/21159727819.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614475d91ffb6---wanebekazezo.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/53758997425.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/vakozexixafa.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f83f814298f88d968b47d95fe4ce70d4/wewebanofikarobujudeveli.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161422278d6620---10291836770.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb5521a714---89636611312.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/73703194245.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/jubat.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/bexefima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=all+my+hero+academia+movies+in+orderPDF 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_off0000bc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC46 16580 bytes
SHA-256: 3cf697a663d03a4e3b1e8be95ad6a11531373395c505b3846ee728ba0f0d917e
font_01_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 10696 bytes
SHA-256: e3279348d766d122ab02efc8667874d43a271fa69660d4441296589c1fc35af8