Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84a22279dd0491d…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 07:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd5561cdeed985f447508a9b799da796 SHA-1: 777527942f3e766ed94a639500c8cf0ac017cf48 SHA-256: a84a22279dd0491df985bea0f60b799840e180131620121cf0147e2d60d37072
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4rm44qnaj0mqnohqfmkdpos5h2/41680914278.pdf
    • https://vansuloi.com/uploads/userfiles/file/42044465019.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/64760778540.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bfa97e73---daroselubap.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ddaba69100bece861d8ef1e12511781/munudipuwilaginid.pdf
    • http://sakuragiramenandsushi.com/uploads/files/galodidax.pdf
    • http://orchid-daikanyama.com/userfiles/file/zotovoserewidajefov.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3264e7861---69443952137.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f575fba26d5c6459e0fb29ceac381a10/39039415374.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/vgq022r8f93t6j7b88qilnu1jh/33318285827.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/wipusoxovirinefajigazeri.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb52008d84---mowunixuki.pdf
    • http://alliance-ltd.com/userfiles/79737850464.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160970e37cee14---65825218928.pdf
    • https://psfund.org/public/uploads/files/cms_files/diturid.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e1d210ca9---13129234265.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076743600f1a---65364615243.pdf
    • http://gillsandgeckos.com/userfiles/file/semativazexibepujezapaviw.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/2nuve527ulaujb5hcledcsa0uc/59646604655.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/om7q1kqsadl2svucvv90uva7m9/mivazesi.pdf
    • https://gadd-asso.org/userfiles/file/29224012428.pdf
    • http://adance0112.com/upfile/editor/file/rolururubemutumisibe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ganglia+peripheral+nervous+system
    • 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_off0000ebe2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 16792 bytes
font_01_sfnt_off000103f9.bin
b51ab845ad8945db857fbbda92451613d8619a204bf0badec2eebde6016e39e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 11016 bytes
font_02_sfnt_off00011d7a.bin
95f39b282b74d5641f03d51cbbf1f326b18b1558d346e0ecf4242c035ae99a77
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 17404 bytes