Malicious PDF — malware analysis report

Static analysis result for SHA-256 931e190b38e4a531…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 05:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f75080cfb947998c6c8786bb74f89980 SHA-1: 038b945271187a9381e09043ce4be2620ab77e3e SHA-256: 931e190b38e4a531b30ff399ab35d459484068848e12fdc3120db48c9c9fb426
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The presence of 'utm_term=the+price+of+inequality+stiglitz+pdf' suggests a lure to trick users into downloading the document. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e191db81bded2f48a5230200ae674e1/76310203637.pdf In PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210714_4EB01EC05284CD25.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/27308847260.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/kefawadapi.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/nakijusoxilosasiza.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a45c2ceb5---mojarixigivid.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/muxagubakugobow.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108220744307053.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/72454765262.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/fabololu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/de7dae45da1926190dc7f36e17b492a9/51258301570.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16089a80931631---torupenefowibasodo.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/bopezojebapebevelapu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/embdqkotnepq1c676hj142m1ks/keripixadada.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/a43d6312bc60882d5d28ac27a2f14b53/rudofomalojexasobeleg.pdfIn PDF document text
    • https://synersys.fr/contenu/file/88551076713.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/lokokofesubiweb.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/vezilezozunuluv.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/uurfphlb3knf3djcldlma3ia50/88773628386.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/kixajexitula.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/lunisawupatotetafabuxid.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/99990756041.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/7366893100.pdfIn PDF document text
    • https://ancoraeducacion.com/images/18212359239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+price+of+inequality+stiglitz+pdfPDF 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_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 18780 bytes
SHA-256: 583fdb300ba469e1475f55b9ad7191b11b658e683decb0af5e1054268c68b0af
font_01_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 11284 bytes
SHA-256: 46d50df59e2e75489936d16924c9a210a99eb7ed2b8003c7f1a5cc2cf60b3821
font_02_sfnt_off000134e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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