Malicious PDF — malware analysis report

Static analysis result for SHA-256 671dca872721f912…

MALICIOUS

PDF

67.7 KB Created: 2021-09-28 17:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f9b963a43c22017ef7ddc598694f4921 SHA-1: e5f37ba3523341fa7fa5f5ab90ad5510e1b303f7 SHA-256: 671dca872721f912c15708e972111be5fac1f5f7cf1e0ab8b9d67039907c5359
176 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many hosted on disposable domains or compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The document's structure, being image-heavy with minimal text, further supports the 'screenshot lure' heuristic, indicating a deceptive user interface designed to prompt clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gikugakasafuxet.pdf In PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/jikuzosuborilepanope.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/70937544835.pdfIn PDF document text
    • http://aeu.pretty-match.com/upload/files/98572638906.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/1421089970.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/paxalitosovevekarasalapa.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/28042498575.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/21463187594.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobarobixifisovo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/5fd2431f9fc1b530c4cc4b19db11fbae/26177025929.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/83231161819.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139566b20747---59015944830.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/xilolamilisapigelibexapu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/r7d058tc25ts7m7jqjf5vfaivm/27833737386.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/49038257327.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/16849953200.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/89073844089.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/71010050545.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/jojaparumag.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ad2bdc9f3ceea66cb2901fceac050974/nodozedugipepav.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/wizux.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/87822807627.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/13476075214.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/19750148084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+game+peperonityPDF 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_off0000ae92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE92 13880 bytes
SHA-256: 09edf03d88e447137975c110fc446660ca33c453f8a81f65ea1d37808ea1380d
font_01_sfnt_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 10616 bytes
SHA-256: f581915e2e19197f111107ac51bd98472a7ddab1b9abc7e20d44ed77312ba95c
font_02_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1