Malicious PDF — malware analysis report

Static analysis result for SHA-256 e017c8d70ac7e860…

MALICIOUS

PDF

83.3 KB Created: 2021-07-01 19:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 743799bb2a1b838389d89f644156fc40 SHA-1: adf489a4cde8815142a3bbef9f27c9a800387f41 SHA-256: e017c8d70ac7e86021d28051458168d3b81091951345f3fb865a6dc6a0c5c823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3987273c27---68707388717.pdf In PDF document text
    • http://www.specemc.ru/upload/files/62092914934.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce457113cee---99930410785.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/banipipaxuvonuke.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/00e31d88c8c89e1034bc873b7d6934ab/salegutib.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2c8963952a6e1c6e75d2cdba9e042779/pojolojajavowajedom.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160729652bfecb---63711020464.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/pozejamefadolo.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/dee20056f4b8e536170e31f92260e3ed/korukasanikepulu.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/wikisexiganug.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/94578461014.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e2a763e0c1bbed504173c925f5b22840/jovepasekijawosagoloxus.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b815a94f8---99021287848.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf0d349746---42667844060.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/bdb4c05641d74ecea6cea101249f2a92/30471571119.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b6a1dc4edcbda910ccc1d9214cbfea4d/3803355395.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///busetofafireriwewixo.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/7m9aqcnm5ras0geo335rtt55he/3555265618.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/3c3e56b81hmgh0i2hncl3ucb23/gagixivu.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/98438029483.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/57520212055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=equation+of+median+of+a+triangle+calculatorPDF 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_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 17956 bytes
SHA-256: 7890d4c18f16bc71f668fc44133678bf9574372031a918ae08380f4e34b66a23
font_01_sfnt_off00010f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 10880 bytes
SHA-256: d8a5c29e5d62c87c8f5056e5e9fe2af879347414f29318f4000e4f3b446add0e
font_02_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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