Malicious PDF — malware analysis report

Static analysis result for SHA-256 1650ca984e5ae83a…

MALICIOUS

PDF

78.2 KB Created: 2021-06-30 22:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 626cbad33208df38a6ba8a1d35f83140 SHA-1: 826f4d3b756b3f830a13a88582e752a1c9d52607 SHA-256: 1650ca984e5ae83a0ca67cb6afb2608f96859369914717eb990028c57e5ac32b
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URIs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc5a0bd5c2---korisemedum.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/30fa1851e3ae526418c3bae55bec5a89/85353936410.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/bapufewumofopekomejixem.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8eedba033---jogobibinoverutoz.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084054706054---kokaputifatonufojivibe.pdf
    • http://au-zlato.sk/upload/files/38891538224.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9c2a4022---pajaderoxunawitorazegowo.pdf
    • http://clarasonic.com/upload/file/24590869053.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/07ee10e6c8fc596a9cb7843c2060b126/43827842157.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/48265653096.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9db54432---55116144213.pdf
    • https://bilegt.mn/userfiles/files/10582592082.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45a82589f9---87925273203.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4d2e5793c4a0baf08a619b295d4fa0c9/sopazijurofewakeb.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c093178b879---bixodafipal.pdf
    • http://robalton.es/Albums/images/file///pegujapagerexelixad.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/de80c90a47e50b4a2c9ff59aeffaeffc/bapejekoz.pdf
    • http://scuderia512.com/js/upload/files/kusifesogipivenirofimotog.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8608cb983---68311115467.pdf
    • https://angkorphotographyguide.com/userfiles/file/dakeputuvovudubepamozaz.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9cd307825---nulikowupepifotabom.pdf
    • https://fcr-fomentoconsumoerenda.com/uploads/files/rujopofafiloforemugujod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+glow+stones+in+minecraft
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cda4.bin
03c67470c5bf17281c7736d0d5c5ef6cc318321ac8afa5d5724a87877df0c954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA4 17136 bytes
font_01_sfnt_off0000fab2.bin
0df1822207157a6e6ccb126c1b15821c9669bd2066a74debe8660a63ebda7f32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 10848 bytes
font_02_sfnt_off000113c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 16792 bytes

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