Malicious PDF — malware analysis report

Static analysis result for SHA-256 f294dc158fdf9a2b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 08:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6793d704205ca624e214dcb150ba3ad SHA-1: 8dd63c877b646b26e2e246284e1ea4e5063cee0b SHA-256: f294dc158fdf9a2b1fed2cc8fdfe53e284659a3a66166a0a3e1566e47daeab9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ersatzmonitor.de/userfiles/file/wetiganazikamurisekatewuk.pdf In PDF document text
    • http://alpha-th.com/userfiles/file/fuligixigatodovilikan.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/rijarowezuwesajejut.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/4279512180.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/87952067748.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9fef11a9adb39abce47fa92fb4cf92ef/mikuvenunitogifobidabi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23ecac06b5---zukeni.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/latupusobozibanexurux.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/kumawabekaso.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5010018cc43c219fca7f242ff6ce134d/66107359704.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc44c27f7---potigimu.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/91633506666.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0bd8e2656---vikodoropefirekebe.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/917887f1aa158f156171360852132ea6/89626146507.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/guwifipoxexij.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/98800105.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/boxomivikutuwutoxon.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c0c91081aece9aecd878f13b1d0cd72c/42119798463.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0822cce423cff9989e47fbeedb1d9b7b/dutodukubut.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088454483efe---puwirusefibosuxid.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/dixejomiwomekobabewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fractions+worksheets+grade+5+with+answersPDF 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_off0000b87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87C 10892 bytes
SHA-256: d3536fd950644c9604cf8865cd46a551f005fe58f0bdfd9b85e2960f87c51603
font_01_sfnt_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 16408 bytes
SHA-256: e14e11810e68dd4d0512960f5ce0dfbc07bc9b67d09896abbab08017bcd1eb3f

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