Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbf8a3158aee5a3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 06:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 130ad85872bd03bbd87b1d103165cdba SHA-1: 88adf999f1c8210e0b66c6ca1fabddcbefbc0a67 SHA-256: ebbf8a3158aee5a3f5729cfbc494f949188bacf52d93b54a8dc5bf96fe7b1e7a
144 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document's content likely attempts to trick the user into installing or running remote support tools, a common tactic for social engineering attacks. The numerous links to potentially compromised or disposable hosting sites further support a malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/cee0ed40fbc7313804934f906fea5350/tiwobibetep.pdf In PDF document text
    • https://t2sc.me/userfiles/sejoxekowanokolebewowe.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c2424e932a106df6f8b5254930e551f0/vipebifobiba.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/13063730494.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/ravatidaramudoboxolo.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/43865365859.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021061701534913.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118be3ed2aa1---limopiratokeno.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/82cvgu7f0hrolbcs8gr7k84f8l/powirumuvejadivenefup.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/mafexizidalevafafilasefo.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/4202705110.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/judidaj.pdfIn PDF document text
    • https://netlandschool.cl/files/57737428440.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9695eda4af2dbdde7f72c6bc97a0d259/20428595391.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/41221192208.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/runinelunemogobirerorej.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/susalodufatolit.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/84165799423.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f3301d055---65159679383.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612939cb0d08b---zovagex.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f2817290b00b1d68ba7949ec8fb4ae85/boligujevedizudasigoru.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6edae47b6---9367603173.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611d97824ea58---14567941313.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fecb2d031---xidivisura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=online+pdf+page+cutterPDF 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_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 10632 bytes
SHA-256: 33413d061cc0dc7e31e431666f78fdded103ec608d529624ba127639bfdb8169
font_01_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 19996 bytes
SHA-256: 820a0e8838c88104c558586533cd6df45209c23415e92788de29d2b24f996791
font_02_sfnt_off0001219a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.