Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d17b75bcd0ba91f…

MALICIOUS

PDF

86.6 KB Created: 2021-07-05 03:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 15bf852f7fed3b43b1545bc0662ed3ff SHA-1: fab6c0e0efca6c486549dc48376f3d77114e0b6e SHA-256: 9d17b75bcd0ba91f9e2b0e295c1f22ef8ddea17c721ff781f0d28c5ff536cb34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised CMS uploads and disposable hosting, with one heuristic specifically flagging it as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs and the 'SE_URGENCY_LURE' heuristic suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://techson-cctv.com/upload/file/67477587921.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d74692046f---79785169806.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c677d1156aa---75280162271.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/56c4nng2pohbd46k1ni0jlq99c/rinajunovejov.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/bkmjjhk1fbvm0micjp4av9ohgc/20860699886.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6da006485aa758bce33f50a9c33fb298/81924708859.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/nurobipelilu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/45ebe3f9e074e5f635a9c6b05108c797/gegosebexok.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/91394000688.pdfIn PDF document text
    • https://hirurgija.me//files/53090641283.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762a59e3605---48874934086.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/64810212613.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160703df4a8b1d---femurukomerupebu.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/gomajatuvasizoga.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/35320704785.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1lq77g777b1oqm8vtre0nf1fi7/99383246981.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/p8frhdqflo9a143j9l9hpl1g7q/kowajarivujanonib.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/lunalokudisedurakoj.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f8iiknrr4334b3i8577uga09v2/zagodatof.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/kuronezif.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7d96e9389fd595a7451d5be6551da6fb/7073771044.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3da0773b4c0f8f85e5dee5a6e499a98b/rugigomewotuwudipejema.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/70588895294.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/lizuxeginezax.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/18636055105.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9e0423a52051f8c0310286e27abff396/87779656912.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/56112674674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=implication+and+applicationPDF 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_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 16924 bytes
SHA-256: 1d91140d7b369566d65f7091717fd36f38ebcbc50c412c4c26919cfe537db07c
font_01_sfnt_off00011e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 10224 bytes
SHA-256: b3950426d78ebac843ec13aebadea759e36df8b84ee0178ccace958bdf76cc3d
font_02_sfnt_off000134f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1