Malicious PDF — malware analysis report

Static analysis result for SHA-256 7859911c6ef0ae1b…

MALICIOUS

PDF

76.4 KB Created: 2021-06-28 10:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: efd39792ebbef540116bd1187dbea243 SHA-1: b3b89eb05659a5ff7728ec1f3650ca806c3f90b9 SHA-256: 7859911c6ef0ae1ba58a2c38ab826a20cfa76cb1d709799f7ed23c30c3a7bca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f0e93cf11fc9c8aaf4dcc5f8f7245412/nitito.pdf In PDF document text
    • https://arrayamed.com/userfiles/file/92894371628.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/wotuvizusajetevovironova.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fb8ad611f7b4e23530d61d8cb8b8be5a/13926074475.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/14db091556306200121e12f49d8566c6/13675715974.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/javofefetovatokiv.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/52987936477.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/zekavizosed.pdfIn PDF document text
    • http://cy2hand.com/userfiles/defamusigof.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/8e6f3c0dc755fd16d788a47e836932c8/bofojebajafitegopamefas.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091653b95e3c---nojixufitepabepikura.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/34542088649.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e81242e03---55844830223.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/t9gq7uhr7pgiqroplgof6bitvv/96603618915.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4835da82d246319759131fd7b4c03dda/wafozovevavevuvasoxare.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/bepijoxulojo.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/842dd76b2c3c60ba42c24af13e3ccde8/21854607173.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6cfc9bfdf---nufejuremazuv.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b869f8416fa---gabonizit.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/38254185669.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/6oci29eadstf162kmf53o5uoo0/18577607000.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4e614ad2f93650c2ea8a0444d445ead/59576757272.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/napibadut.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4i2l4fdmg95l3r18bd2ggc6e4/pagifusagofigaju.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/vomumajaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=a+separate+peace+questions+and+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_off0000c7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AF 16644 bytes
SHA-256: 2b26d9cf956a6443fd269769f165b4fc9d6e935cc5844f80cb00207402175837
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 10772 bytes
SHA-256: bc40f809a7da46cb994cdb218551f4438444243371518471f8e30fa6e91cb12a