Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75e4e3a8e55ed33…

MALICIOUS

PDF

76.4 KB Created: 2021-07-20 04:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 73b9fd5d1ed225870e6a2839afe992ba SHA-1: c5c150833d00773b3fb7fbd2aa552946f231bd3c SHA-256: e75e4e3a8e55ed3343a31360462730a1eddf421b77aa8ef0da44a9586a31f37d
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b0c70f8ce---65654277744.pdf In PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e767362a910---78168937747.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/minigidavilisoxojo.pdfIn PDF document text
    • https://schmitz.cz/res/file/67872085709.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160852f991fed3---jubolofelovexigu.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/69566751299.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/74444836606.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c860425d48e---vagiferizowub.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/9341380775.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0e0idl3mdgjc38rtu0ts6vd666/vimudol.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e9c70d82---98961764719.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/lusapaf.pdfIn PDF document text
    • http://dakmet.pl/upload/lodewuvo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a99f97db4---11908469471.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/90775044375.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4dscmqg1s3du69h0vh5ekf1v13/xepoxuxakoxefegawapedone.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/oal3vipfg9dpqrhfgv676j8600/zugisasalalasi.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/59413205390.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53f7cd89d---tafoxegimudexugujuku.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160898cbeb7f8f---7089788815.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce25c956da1---94333646389.pdfIn PDF document text
    • http://gdgom.com/upload/file/210703235728860341y3c1fcl6g9zd.pdfIn PDF document text
    • http://prosquash.by/data/19261229188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=whirlpool+magicook+microwave+oven+user+manualPDF 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_off0000c720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC720 16692 bytes
SHA-256: aff6fe09d42e48336bc14b985c03c5b8f004a050976ee6cbbe5ac850c27f6660
font_01_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 11060 bytes
SHA-256: c43bc8b51c53cc53d2a979a129b26d6e0453f26d8a457245d616d4b235f848f0
font_02_sfnt_off00010c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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