Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3952a4ffb0d46e…

MALICIOUS

PDF

89.5 KB Created: 2021-07-22 04:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0889cbb7641848ea3cda500cb458001 SHA-1: 8236a2860c46eb1c3ca5670e902f90b9852c6d28 SHA-256: be3952a4ffb0d46eda459b0007a720d741b41daeeaa721d65a3777591b97e437
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO spam campaign. The presence of multiple links to potentially malicious content justifies the classification as a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/b5e7019798d19f26efc72fde0412d507/76989963267.pdf In PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/84703324983.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/luwakej.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fkum4f44fe9b98m128c5jjoncq/daluxezifineluxidewedolu.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/36299722522.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/13615635349.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4ro60vudgl1rrdatgcq7camfr6/dogakupibuwetabojinegul.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a775cad8045---74307698511.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e562a7cba75---bogefonivobotoga.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/nusezowojatepaxa.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/wemakunavivimejasu.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/93332490279.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/11674049870.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/fijokibijopira.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/xidematesojunusinubelata.pdfIn PDF document text
    • http://bwc.lt/i/65412862743.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/sibosopijojaxabalikedol.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/mepikegolawe.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/gopevijigutowobogeraf.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/68265356571.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/69451607800.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3gp3ps3mci1rbkjd3qv9d22k6p/5186486061.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/luxoguzagubava.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4647083a54---xawegiduwubavomafetunojo.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/57snqjkkev13jciv1n1r0531up/wazedo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c3bda6f26f5f0d3978d5ad9b6a771c9b/81800812315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=reading+comprehension+beginners+worksheetsPDF 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_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 16776 bytes
SHA-256: 9d0b38cc3e8bbd116684da2d2d92cbe9d971dc4f67f9e50d7114c0d3fd9bebe2
font_02_sfnt_off00013c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C32 11280 bytes
SHA-256: 1621e2902c5d96f570168e572bb2314f2451eec1217fefff9200767f5417da6a

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