Malicious PDF — malware analysis report

Static analysis result for SHA-256 723f101bbac3b7cb…

MALICIOUS

PDF

86.6 KB Created: 2021-07-14 02:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c0dc5e6632d7a7e71dbdccb2bd7bfc30 SHA-1: 5e8d312b723146467f3dfcc8ba7d61a0488150dc SHA-256: 723f101bbac3b7cbfeb542e2a2aad308c6c08e2222497739dfd3ca7ac20ae1d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://lightofislamonair.org/uploads/files/ledowoxibolup.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3ec4170ba---51750350293.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/6m3h3nhkglrtibu3tajt8hcj1r/pixokofom.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/lexotovuromegenexinivode.pdfIn PDF document text
    • https://activepymes.com/pub/file/vuparof.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d69584bdbf6---duxikidopu.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/74676914048.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b57c9cc24---fevogopiwofexodemekiruzun.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/pukezawojupu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/rloeqcuerl29dhoku4js1lsv15/visojifumusiluxewitujane.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_233734.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/93190016554.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c539780aa949e83c0a7a9600fe5380a/melexumiram.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/d03372af82fe1db7cf58ea617402c21a/lexepodege.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3c08d1d5---joluvaguneziwoxabomola.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/gukonetonasefap.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021053022535380554.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/6ve4buuc6aookgbdcb94credeu/dudevobomowekav.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/zejotarekonudumabomiliko.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/c4307c52010455b57c68037621e08c66/tutori.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f33fd0a422b16f9adc8b8a74ce65c416/73608430207.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/f3bh2202a70stkk63m04fbvlf8/28389923113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sprouted+lentils+nutritionPDF 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_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 10400 bytes
SHA-256: 73fdd8f6ef21ddc58f06cc129bd817761101b523d8fe48d103f8c0016ddd20fc
font_01_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 17196 bytes
SHA-256: 432d9fc3ad607aef959e3206e50bdd773e6bf2ffa2bff695db8fc5c4f3b2a49f
font_02_sfnt_off000134ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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