Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e473629f3d9592…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 02:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e2640676e29b565cb82975acdb55ffc SHA-1: 08e641d3720211bbd88c524544e37e37788b14c8 SHA-256: b1e473629f3d9592849b6af219e6945eb8d8678afc445bfb78d6db405a8faa10
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the heuristic firings suggest an attempt to redirect users to malicious or compromised sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/d51d0a4slvc5fmhjicjsknebbg/porisexefezetowapesikovef.pdf In PDF document text
    • http://nccutrackandfieldalumniandfriends.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/2302785680.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/58390165416.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ea04e688f14ed49184fe5487b65ad6eb/72250146509.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fbbe3fd8d17---nujapifejaxig.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160961eaa1af7d---rikusitukavebabudubekoso.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210714042718.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/saxofatutaxuvajewasubisi.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/ropudabixi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c39247a7---32264920234.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160822eb907b9f---juzowitokibabalinis.pdfIn PDF document text
    • http://popmetre.com/news/files/2010149805.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/71503632182.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/97962611165.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077868bb1ed8---ludexivefazajuxirarax.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6299c95a---33556957210.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/27449326120.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87dfd2cf5---35154036634.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/dapimalovizunasosu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vebiludutalaramo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945df45e916---nagegabusivexejo.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/66860177192.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/begaranuba.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607d1d6b180f0---begosulomadim.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/tupawiwipus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=coloring+worksheet+letter+ePDF 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_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 17108 bytes
SHA-256: 28f22fe6f0f84ca5dd3b2cfb1644fd777d197f86ea7bc93b45aeadd9e0a081a8
font_02_sfnt_off0001201b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201B 10432 bytes
SHA-256: e5973d91a695b11c07a7e101a62ed96fcabb740646bad0d1335c157444e2bf60

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