Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee523c4d0a4eaf35…

MALICIOUS

PDF

81.0 KB Created: 2021-08-25 01:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3de30a364c010f9dc4c02bbd88d6a775 SHA-1: 931f8cc6c46e1f79b410a201b97e784575a030c2 SHA-256: ee523c4d0a4eaf35757e3395e535761b776912fdbf0c0e2a298755f7418eb3db
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to compromised WordPress upload directories, suggesting it's designed to trick users into downloading further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic of using password-protected archives to bypass gateway scanning, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a442bd7ab5d---27937252546.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ba106fcbe---51549891783.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e853eb7ab63---35101812279.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/segolutigaroraz.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4868bb64ef---peresiwogerujirabe.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/69a1c1b0803dbe84350dcb5eed17ac4e/sawifopozunatawew.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/28378622934.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/63787785420.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/rivonumumanelak.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/85324676366.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/25400644953.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4df1f5f52eeff315235a90cfc93df7bb/sudiruwatixa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fa49e107ec2---nosakoj.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b8b3edc63---23428691306.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/pemavok.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/rofofolovaleluz.pdfIn PDF document text
    • https://wecareprogram.org/images/file/dodizoliruw.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c41ccad35b---jumap.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085c9c81368a---nesimoviregitumiramafomo.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/n2mje1dv19d0j88s9s6lee8bmp/46292108077.pdfIn PDF document text
    • http://cartolmania.it/file/9406874286.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210514/file/fefejasimamaxul.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/51396729870.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c725daadd---sadiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=local+time+in+zambiaPDF 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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 16772 bytes
SHA-256: 7f4915950f751319c8e48e104784bd443d64e44a37a9e6d6e31ebefb09d88e70
font_01_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 10280 bytes
SHA-256: 36300b452ff05f6f611bd74b9fad031e469dc9bb0efad1a9219fef94ebfe5f92
font_02_sfnt_off00011d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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