Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e422e9fc4bb3861…

MALICIOUS

PDF

86.4 KB Created: 2021-09-10 16:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e871fe33c2cbb3e32a8277a515c2f017 SHA-1: d10dd541acac95d4557fa749c1a69498632b7235 SHA-256: 3e422e9fc4bb3861bae9a1e938b3dd2330eed0e2c6e1c1d69bad0228bbb36d81
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which are hosted on compromised or disposable domains, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs, including those pointing to compromised CMS uploads, supports this assessment. No scripts were extracted, but the overall structure suggests a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://verandapattaya.com/userfiles/files/57136085452.pdf In PDF document text
    • http://na3.it/misc/file/93549942505.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/wejawikizonevajefipi.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/duxukuri.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/28257177601.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139549aee74f---gimud.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210910151644_3z3jmc.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/60135792034.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/10293410345.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/xofasazimixukakumuzesod.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/jukisobuwizizaget.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/padixomasonudujadoki.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/kogozuxagu.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/64730823331.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/68013976149.pdfIn PDF document text
    • https://grouptm2.com/contents/files/kinonorofadapa.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/wegoniro.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/muboxuberovalusalerelite.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9b1hachaaarf28i30kc4qqnen9/79653101978.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/7125048313.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/68230947780.pdfIn PDF document text
    • http://jump360.co/upload/files/20210905150038.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/naselizadavelegifin.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130be31b8060---jajulexikew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=is+heck+a+bad+wordPDF 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_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 19368 bytes
SHA-256: c429c0bc1d56d12a94ddc60ecb8e79c6f4dc15fb996dde08b315e81a6ea3ebbf
font_01_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 10396 bytes
SHA-256: c0c35458a0f2fe378f693e90275f4eb824f44aeb66714514aebadae7fd8950c9
font_02_sfnt_off0001344b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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