Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbd102f2a9611e1…

MALICIOUS

PDF

96.5 KB Created: 2021-09-05 12:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 425729aeb2bb6745ea28100ef3a88830 SHA-1: 13e0e4d5dc00a2a69792c6b96745b625d4a8f06b SHA-256: 7cbd102f2a9611e12d6f88e0eb903214c29fb5b51a935e39956c45746d6340be
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting. This suggests the document's primary purpose is to act as a link farm, redirecting users to external sites. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown reputation URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d76116256---jomul.pdf In PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/fuzid.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec406e1401---dodaxudufexiveve.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc88367290---56473329359.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/20463247575.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/18283374966.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/58933994068.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f4b555022---turukipelax.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/nolefetemomo.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/lujubotatalokozuf.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/47739240852.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/doralovejo.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/3f5795a74ec45d6ea940901f0355aa49/nejilulapewuneliso.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/34657898517.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/n2qglsp23j2hj70mpb4qnm62i7/govepuludafizo.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/zoxutokejilubirox.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/rumipebelazelexo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad019c5a6e---76044090629.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/jerebiwiriwosowawelo.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/17518271086.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6bc966680---47454538253.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/96314632402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=c+klein+mineralogia+zanichelli+2004+pdfPDF 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_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 11304 bytes
SHA-256: 6d50af4698cc237588d1bee0c12a9184dd7965036f11ff8a0ca681f97f826801
font_01_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 20232 bytes
SHA-256: 813e4701670401ea441ce2f415c9c4a9440c89a7b2485cef479700b3003535a2
font_02_sfnt_off00015bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1