Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c5547f96394592…

MALICIOUS

PDF

121.2 KB Created: 2021-07-13 16:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 628467327884d7580378a706ceb75ab9 SHA-1: 5d40119b3f70ee0ec0f0a03da4f5494d7e39d276 SHA-256: 68c5547f963945920d87822a18a71d08882c67eb05549420100571c5e963693b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, indicating a likely attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://donauwell.at/userfiles/file/rogofajazekokusadebixobu.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b5e9a9a1cc0430d21917e55b41bb7262/vukebejidefaninuvogewa.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/69205080908.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/9f81a4783971567417532796659c8185/34338700491.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc043c74fbc---68699163973.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608606e61e13e---gagokinawusiwidivifiwewun.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/tivegumuvikulumodoz.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/91231429317.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/04444e2cf82e072c33853ab84f0fefb5/puxuluzuzoveleviseze.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e4d6cb31e---vopefufanisok.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6072ed5e86---bipenapuxojuvaxezebadon.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/wisizavutego.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805007ee4a8---lapegemidixuxixukata.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/29755667026.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021063018223210.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0f3b353b5---33830944511.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/52598361959.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/gilegepu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d77d8a7fc74---konubajidadojiri.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d53a89e1---65235780446.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/16357749723.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cc4e4edc---wevedevoti.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160718722446ef---13623530489.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160871239389f6---sipalujokolalemufoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=college+writing+from+paragraph+to+essayPDF 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_off000179c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000191db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191DB 11036 bytes
SHA-256: 171caba1e23b707dab83c0668225e525eafc7aafb47e2f2af6335e01ba6fb09c
font_02_sfnt_off0001ab79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB79 17176 bytes
SHA-256: 877acc8b3281ca430ef07247c0e2d99e94826f7fa657a4c3623275a5eb8d81ff