Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9e9fbec9fd9e4e…

MALICIOUS

PDF

157.9 KB Created: 2021-06-29 14:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28604216595889a525241cef70f40f43 SHA-1: e83a99e7863021cb4d6c8c7587298c65089ee030 SHA-256: 8d9e9fbec9fd9e4efe40c84e35d9e694288f6f05a08938263bba26932ccf942a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be compromised WordPress installations used for hosting malicious files. The heuristics indicate a lure for password-protected archives, payment redirection, and MFA harvesting, suggesting a phishing or business email compromise attack. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9246

Heuristics 8

  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • 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 https://garglob.ru/uplcv?utm_term=wow+2+starter+edition
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40348eae7---88884765970.pdf
    • https://betenagro.com/sites/default/files/file/99763086927.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f3c842e56---39702381232.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/wowunutije.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079953b4d6e0---13065884533.pdf
    • http://normel.org/files/upload/file/47239526097.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/c5qnrbub8ki551kpd40cjrl881/vufileluporogoz.pdf
    • http://thessalonikiflights.com/files/files/19148738286.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ef21a30c---91000023470.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609566ac0007e---bogajowotefobukameze.pdf
    • https://kaptenhoki.info/contents//files/zipiwipifolelogabi.pdf
    • http://barudan.hk/UploadFile/file/20210525104621905.pdf
    • https://oklogistic.lv/upload/file/poligozuvefegujavod.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7ddcafa28b3e3f766a331f009fb00d7a/49178599576.pdf
    • http://gsmontaggi.it/userfiles/files/vojewewoxasaxasizifi.pdf
    • http://klubalfa.org/img/userfiles/file/97685321697.pdf
    • https://najlepsze-w-polsce.pl/uploads/19564140010.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/talokofadituresoduxulusi.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8fddd68e0---jotukejuvedenukapujoj.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/dd646ac587c176142e0b81a5d80c9c9e/laroniwipojap.pdf
    • http://bright-mineral.com/uploadfile/file/2021052207024121.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b1268210---29350995424.pdf
    • http://ubest.ru/images/file/mesaxetodolumexuripejekes.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63a872428---11096162692.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d241045566---lametifujomulivusowi.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/64a3ca03664de1ddd0e48257a89f89c9/23752129020.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eade.bin
8c2e9d80d580d08964a5048de7b59c27befd741f1c379efd0abbd599686b3e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EADE 16216 bytes
font_01_sfnt_off0002008c.bin
4364e87fb06a789ef0863dbb6341d5546d8ce452937e269a3b670bf304268446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2008C 10396 bytes
font_02_sfnt_off0002185d.bin
f12875cbff04d31b24b9363aa81a1bf11a3b1b195612b7db229db38fb4ce2f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2185D 21456 bytes
font_03_sfnt_off00024fd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24FD4 16792 bytes

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