Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed3cf792df957b5…

MALICIOUS

PDF

91.8 KB Created: 2021-06-30 05:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6af0be79a8211e6620535a81575b6bf SHA-1: 61f4e19ec081ed5f9074ea30bf3b712cf5bd5df3 SHA-256: 7ed3cf792df957b527402ec5473060ba0872c75d262153f28c703f56d41d6eb2
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to host malicious files. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=ghd+tv+for+android
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c888ec34b2e---guboxugikodonosixevi.pdf
    • https://avonsteel.com/UserFiles/file/tubigitelawujepi.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ec5ab3b5---jivev.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4269ce10a5---xumokabik.pdf
    • https://ludifrance.fr/userfiles/file/mijoresilomumuvas.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0f527413efba34a97caf19bec288b65/71203283856.pdf
    • http://ahxxzx.com/userfiles/202104/file/33654899159.pdf
    • https://tmtteks.com/files/43174766798.pdf
    • http://sgyscom.com/upload_fck/file/2021-6-20/20210620142552830075.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb407c5283---97246128929.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a35ef94d10---6520771981.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/mra8c9h0l42r3siaeerdns1qph/gatiloges.pdf
    • http://pc75.net/upfiles/file/1622414549.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d224fa245b---82420262923.pdf
    • http://ibb-online.ru/f/file/nujobutezijevuvozunubaze.pdf
    • https://mediaget.ru/userfiles/files/12168568688.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fb13048d911d4ed98def6414b0949414/91050502485.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/0837768d0d27c1c31dc42495a792e5de/lizekeborobobagasa.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/33edcl2ek5vchk8sba4ukvc651/72468372310.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4962cb24b---sijosuf.pdf
    • http://verduciautodemolizioni.it/userfiles/file/mirebiwune.pdf
    • http://extracam.es/app/webroot/arxius/file/vobed.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c1974d68ce2c622c7048beee3d051b58/89667718674.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/319175d44a6357ae0d76ec3f393c5b35/58213176417.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5712b99ae7---tumadikibimux.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc87e48d7e---wezutotarilozesasix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d1.bin
a2ade8263ba5c8d7c8b836dac4c328ac2330507ed20912f95c2fe4aff36a097d
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 18184 bytes
font_01_sfnt_off0001332b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1332B 16792 bytes
font_02_sfnt_off00014b42.bin
f9a3d3274948c43e03001cc78702cd411f6263b3f2dfbc1a0ccda681f4b98424
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B42 10208 bytes