Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca03928ed9ece957…

MALICIOUS

PDF

101.5 KB Created: 2021-09-05 17:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 58f545f7f91e9fb1a9f3812c586c33ae SHA-1: 513d5b96dcdba45bcc585bf1331358fc2c861e5d SHA-256: ca03928ed9ece957236d8d9fd7ada7c190a76c23ba3cb034fab9a37305711869
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of these links suggests the primary purpose is to redirect users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=spartito+il+trono+di+spade+pdf PDF link annotation
    • http://cancunday.com/travela/img/files/tokefefimub.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f3a0661dab6fc9dcf029dd3694f4dd54/31550533018.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21cfcb0e4---zuturufepepulinodenebik.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/reladi.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/13008955257.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/kupowapoxulak.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9358aa09b6dc9345890bdd251e913f2c/zapog.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/bigatajibopanegem.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/8423224323.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd25793d0d---waropalizuwupipona.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/palizok.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b82e922563---29442446569.pdfIn PDF document text
    • https://digireg.si/upload/puzodiveratirag.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089639f824f6---59751360416.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/sekipomori.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630436882_8029847371.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/98065592053.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/relanilozodubikitanuge.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/d6i2ljs8ce1caku65nmbl0p324/64713787703.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/0emqb04nras2tth51t5i0f9rog/20590235078.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607487bbe0bc5---wusulikadazigumefoxaso.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_off00012528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12528 10564 bytes
SHA-256: ba4fb77d3ac511fa40a33e556399f8889a2606564000d9f7599de929ea5c75e7
font_01_sfnt_off00013d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4D 19232 bytes
SHA-256: a5aa1d1f0a465d58a9d82cf20bbe7833e2cb083f6b2e59841d3473c94824fed8
font_02_sfnt_off0001705b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1705B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1