Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ef1ebaae409661…

MALICIOUS

PDF

69.3 KB Created: 2021-09-02 14:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2be3eb33f36f1f0a8cabcf02727aa6e SHA-1: 3f8e78da4db9b4b104f32a9cb0cb7302a118add6 SHA-256: a6ef1ebaae409661ce703a23751d34cd6c49b297624cc94bdcd4c0ce7ac25b67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to redirect users to malicious content, potentially for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

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 https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/59621bade908e4128ab7fbb8c92e6a78/goxobesidetofixud.pdf In PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/sixedupixinixa.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4mgtnf5v3q3jl2edevv0d6m5b8/10795944995.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/813b5a5f5b36bf42a7a0d4239bcdfcee/28499881136.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c1e104c0f---sepapeferil.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef7aa6bda1---wivekakoj.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/85961831135.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/18872765122.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/10f1298158982ad1c1c84245464726cc/82206726675.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/nejubakabe.pdfIn PDF document text
    • https://songhong.info/userfiles/file/72754420978.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/rutare.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/47778697089.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/rajimizuxezanege.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/xatumafo.pdfIn PDF document text
    • https://menu2uplus.com/images/file/61943903206.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/vibova.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/netologoxiz.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/0b7kbgpm3mns2r0km9n17gbnc5/tukurarufekavapovijilo.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vl2a1oih0rt0i0f4cpn3kbp5o0/sofufuf.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e77aa88c9ca213930ee7fba73f990a8f/raxexekatesane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=angina+de+pecho+pdf+tratamientoPDF 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_off0000b056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB056 15772 bytes
SHA-256: 49f25e5518d2ab7f8b7c794988a8719fd2069bf33ec8ac9a4990cb7ee7d35586
font_01_sfnt_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 10832 bytes
SHA-256: 36ccae42deb1b1c91c8b30879c3a627f806b1914970d37c5c726d4b526220f97
font_02_sfnt_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.