Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fc117a02cbdbb9…

MALICIOUS

PDF

96.1 KB Created: 2021-08-09 18:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d89617c76ed3b01b1d24392cb874f882 SHA-1: c861f05a8ca2526b4c8dbf3cf656ce0c461ac90d SHA-256: 73fc117a02cbdbb967f27e9de3e8adc693e37474e18f34faff7c5b365b9a7658
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing form plugins for file uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms the use of compromised CMS uploads. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be SEO manipulation or redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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://crewmak.ru/uplcv?utm_term=kinobody+warrior+shredding+program+pdf+download PDF link annotation
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082076f413fc---lufagakijitelubu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9f45bbc1c2ca82eca37c95948285ea65/lexer.pdfIn PDF document text
    • https://ms01bet.net/contents//files/3587396501.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/25209044455.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f243b6b0d66378de905c4f565960d96c/63390643522.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/pipepa.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/somodukoxulefatovobabi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce71128299b---babivifaladesuperola.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/57639112630.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8u1b3ttq6aonjlqluj3qifsd4/10985957528.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089be9c0d937---70690937624.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/wuvinepajuxawi.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/335800601.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/85168231331.pdfIn PDF document text
    • https://12tiga.com/contents//files/99366656470.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/dffa2be3c43ada6c1552634e7ee83f6c/51406877019.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fekabezimozufubunazog.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4a48b503eb85944e3a0f2d3259494cf4/86281201390.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/57635183367.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/gepuzeziluregepisen.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/8319970295.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4b36cf0eacdc503450b45f33a712973/rebaninuzemokar.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/dulamamegadegabab.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160725bfb33400---kezovifosenu.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/xezirutulaxeloderuzom.pdfIn PDF document text
    • 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_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 11180 bytes
SHA-256: 1b52840542b2144531b86b94f4b1bfc5644b97fb860af70ad10871a638dcd83a
font_01_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F0 17324 bytes
SHA-256: 74d6c368e2dcb23240ae2d86bfabc2bf0c9bf35e56724796de5ef08494c9299d

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