Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd401ad763439a25…

MALICIOUS

PDF

69.7 KB Created: 2021-10-13 02:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 612e0d8898edee20013632de39086eca SHA-1: 668f06679c314e9bd47f8118d4827ceebc7e58a2 SHA-256: cd401ad763439a25965e849b7d7c95b431e8376c42fd885e01897f556db92255
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further exploitation or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dataprint.ie/uploads/file/2892490818.pdf In PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/jebitodowon.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/23112318185.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1616080723f81f---luwibenegexagip.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7e68cf8d4---lafogubakovumotodilowow.pdfPDF link annotation
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/69015304365.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/39945560929.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/58383061302.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/surixemusodavabulunobo.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/16450162668.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/44198494369.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/judisunuvof.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tk0rufjr61u8g9p1ljlqrofu74/girolibomifisosizulogit.pdfIn PDF document text
    • https://gyvatukai.manovonia.lt/images/files/74074280288.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/59331908277.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/remaz.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/77756291421.pdfIn PDF document text
    • http://artio.pl/files/files/guruzigole.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151b4a7b7b33---77531264924.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109301802334350.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/vetafarevukupikakak.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/22070872028.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/sajuteliverurofetedoz.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/vItLtdF7Pec/uplcv?utm_term=coupled+reaction+in+thermodynamicsPDF 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_off0000b311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB311 11024 bytes
SHA-256: 7bbda0e72ac44a73e2332f51fd06521979e10d6f3d659cad0c5eedeea3f78a48
font_01_sfnt_off0000cc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC88 14468 bytes
SHA-256: f53cd807cca1be6d4fb95db5d453166a4ba39b6acb00ca3385480b48c997b65c
font_02_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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