Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1abfa30b9cf83b…

MALICIOUS

PDF

79.4 KB Created: 2021-08-20 00:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e131a6649c7949bcf94a5f673f6a130 SHA-1: 0f57bce7cca58c3e7fe41ea19fce8d64786617eb SHA-256: 3f1abfa30b9cf83b65edaf9a2088d9d0584a84db9af043ca9d3bc4620bba0f4e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware. The ML classifier strongly indicates maliciousness. The presence of embedded URLs and the structure of the PDF point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/uplcv?utm_term=microelectronic+circuits+7th+edition+pdf PDF link annotation
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/mvuslus3sdvpjcfke4jeu0gi87/xowifabukaboso.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982eb56f2c6---patewasenedagitikexaviwot.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085ae20b929a---7351062058.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/rutmmdf135vtqhtjnvemvb6mdi/46418030322.pdfIn PDF document text
    • http://cocoal.com/uploads/file/pawujarurexoderutim.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3f54df380fc1d6f86cdd1a4cfd48928e/72939652563.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/susurawabijopiruvekoweges.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8e00b2c8f---dunugebifesamisawilixapin.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac699582c2a---lunidoxedobuwitagi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f58ef53af8---tufuzenusot.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/7870232218.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/lagirukovotegasu.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/winawuroferezetetabep.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4ed65b717---dolamesokaxuzunutorogape.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5672b09d72e14dcaeefa66dd895cc18/mifezerolufaderuzegoze.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab7061aa7---kowuwasesubivo.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/monomadipawanakab.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a1b04395e---29683683376.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/54d5b56808fe3840fef409f1703c80e4/rovevazunodakovulik.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/81243826189.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_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 15676 bytes
SHA-256: 4fc1d1cd1075c2c28bd89f1ae2aeb7707c7bd8482842a29456ac49861ab95552
font_02_sfnt_off000116b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 10700 bytes
SHA-256: bf361511c1bde95bf7ac24514a2c98f5ccb2cf45895a69649ee1dad4bd628eee

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