Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d6c9ffdc5de145…

MALICIOUS

PDF

89.1 KB Created: 2021-07-25 20:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4f71fe522177efcac73992ca632c556 SHA-1: 8ed8e988bab404e022982b01dcd2d05e542d48c9 SHA-256: c3d6c9ffdc5de1450f0574d1a45e0625427e7ff6b3f7fbe2ee267772054852bd
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicated maliciousness. The primary purpose appears to be directing users to potentially malicious content or phishing sites through a deceptive link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/a5jcncurvbv0tputt7h3oud4e5/86893638949.pdf In PDF document text
    • https://bangvetthuong.com/luutru/files/lujobezawib.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e257999c75---33960162659.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/33f9b51f6526606ae79032b649562676/20816502601.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/fid5arodi33s8nb8adu2dtr2a7/32199995884.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210723135213.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/56b8b6e533d966193318c77f1b68789a/rajitimelajeneseku.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac004467054---15527020458.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/44475596087.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/wusew.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/30391358626.pdfIn PDF document text
    • https://nattasampun.com/upload/files/sorulewukoxenijusaro.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/95197635063.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a84545c1---26735103532.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/53e0a643e235c267b624bad9ed36628b/38710472611.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/cebe253fda4414a015b11df895eb8c31/49073561785.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/zugogawa.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/46537513102.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/66987038779.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/9828628221.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607833076f9ad---loluzaguzasip.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/898e39d1cb05a388acb32f3aff367720/78593607049.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/fedegoru.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/zutaxes.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096310a65b42---13202795595.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u7meul05nul1q44tebkecb68sb/12327864628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sniper+3d+hack+apk+download+androidPDF 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_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 17652 bytes
SHA-256: dd99c3bf9682859ca7bfcd6785676913ca8d369ccd35c1e2a1aaf238b12f7154
font_01_sfnt_off00012511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12511 10768 bytes
SHA-256: d5755f6591d07b806d2f5a96447e167e8d0681be4b52a84cc3c9fe1752935044
font_02_sfnt_off00013dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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