Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7ece6b03eefa9a…

MALICIOUS

PDF

85.2 KB Created: 2021-08-23 11:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40825e51e159f557d84911b479f6e066 SHA-1: 8e14d885774f55f4c053dc6a81768fbc61518e63 SHA-256: 7c7ece6b03eefa9ac2b7ab808ec1774ee449c77a87c65cb09454df471afd364f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits malicious behavior through its extensive use of external links, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it functions as a link farm. While no scripts were directly extracted, the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to redirect users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pistant.ru/uplcv?utm_term=director+interview+questions+and+answers+pdf PDF link annotation
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/19318864ed43662e3af83aa0b870a07a/xesokutuperutivagav.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/99127929318.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/nujanixefanuvovakeguj.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc3fa3f4f---jatajifobolo.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/gafasulogujovufig.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/87459250534.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/lilivobomama.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/11824086309.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/wiponofarudovujopu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d241d0e02---33061408052.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/r4cu2t9qd3qokth8i3g1nje330/ratekisorimutebox.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/eed18d4a7a3d9a210d334031a9c8ae1f/jibuj.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/kokisoroguxejaxenefuxuza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7a405bb9---zolakomoxu.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/55345802576.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4c2d3533bc4bce9abfddc3896872d8f3/55408935233.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/lokage.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6acdd669---vawisig.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/lakagino.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/16500211089.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/671660bb3dd6919f78cd73a8947cf2d6/pekovewizipetirozakosu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82f126f15---86027262379.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/lefigurimujimudesirulujel.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/94goep52t7d0dhaamar34de0im/vaberuwimapozidibejo.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/sitesib.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c676b763a42---47048465550.pdfIn PDF document text
    • 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_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 16960 bytes
SHA-256: e3268249346b6cb8c4bbadda616f0f31eaa84602bb32f98c49fbe9a35f699e28
font_01_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C16 10964 bytes
SHA-256: 22b8464a7ceac420c4c2cb809214f89b311f014e2fb44a416f8239f9c9ad1396

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