Malicious PDF — malware analysis report

Static analysis result for SHA-256 4154bf632455a933…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 02:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4267baed68b2b8d436fd1f4c4a50dad SHA-1: 9013369efc30aec1cbb7b557b24d9613b243afc4 SHA-256: 4154bf632455a933e6b56fa49018e2dbb4e4ce61f9d3ebdbe789e6d250bb68b1
204 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. The presence of embedded JavaScript and a lure for remote-support tools suggests an attempt to trick the user into executing a payload. The document body, though obfuscated, likely contains instructions related to this lure, and the numerous external links to potentially compromised or disposable hosting further support a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://boekenwinkelindex.nl/images/uploads/25877382777.pdf In PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/43949297481.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/13284346400.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/besomerovotiturivutibigok.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/bogukomolapobemedadutogeb.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/kigoxu.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/lotonoka.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/98415239151.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b9d4d815c1ad5eb9eff969768b95ce8d/luwaludulatufumikiwagosad.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/29128091182.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/065a26ea0896dc40f704520e59096e63/5596738008.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210910_9BADAD9E2733C5E1.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/56783432410.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/sixovomidifisigameb.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/86417438840.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/vugarotawurule.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/88515133224.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/93324949887.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/29264292848.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/66887800819.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/66878347185.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///sutizosebaxuxavuxam.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138e582088fb---pisufome.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/tenuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=using+linux+on+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_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 18260 bytes
SHA-256: b7868ffe2d59043aab01771bcc6c3493ae7252b3f32c395bbc8652437e778f7e
font_01_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 10404 bytes
SHA-256: bb979665fe512d06955595eaa6d7aa390cbceabb11af10297d905b4d96e375c1

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