Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dd47543a8efa32…

MALICIOUS

PDF

79.6 KB Created: 2021-07-04 23:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fec1975de7bfe94e02357f0b52cc3936 SHA-1: daf0aa77ee6eaf181693815c4830b9c7de8ae5d5 SHA-256: 81dd47543a8efa32200c2d2fce0addffd9cc8c5d6d22d0ec015784b165ea4153
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a PDF containing a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malicious redirection intent. Although no scripts were extracted, the structure and heuristic firings indicate the primary goal is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4395

Heuristics 5

  • 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
  • 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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086badfd28fc---jotowetupudukadavuvej.pdf In PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200883524943.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/rexorutu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddd5843dc2---566419577.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a1b4444c---74295595089.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/xiduvibazugidekomofu.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3b62957af2785ebec0ed68bbcd355826/47174148767.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/85090494448.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090fb9ead78f---barivegilopatamebapobuv.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6e85udskf8ie65ig8dbfdgoe51/pefewuvomaliriralexadosi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608361e408a48---nerup.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1g3mpjhpbnvjjvdt5ogh36t8r6/sesefemuboraton.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc743f03ea---xavesezaduralejax.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7suoqq0guk0llidh5uq4qkjvqa/78528471576.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/g6g82rkc482fk0g18spv5fkgc9/kebeduzazenekifujaze.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/banujefax.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6ef1640dde3ce1cf8e577e07ff8aa036/13742453163.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e9b6f41d3268ec518c84bf8be827ae8f/nulaso.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/jedosadonulawubarubetaru.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/92890005819.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/residibopifinovitunituz.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618488b288---totuvuwoviwusejij.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/6e6g8vactbpapmjnp71vqf48q6/xapovog.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/38415063995.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a7a0aa18---9367942519.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/kagixitu.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b48925842e7---34023753020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=breakthrough+will+come+in+the+name+of+jesusPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1