Malicious PDF — malware analysis report

Static analysis result for SHA-256 a854136814fd7aa0…

MALICIOUS

PDF

81.7 KB Created: 2021-08-24 21:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57577a5482e4e66323c529b63013ce35 SHA-1: b9fd694af5e2738499d631239975742cb77e4182 SHA-256: a854136814fd7aa0e3c6bf073a641a09112ff091ece4d7ebfb3df6223157ea8d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a lure for phishing attacks or to distribute further malware. The use of compromised CMS upload storage suggests an attempt to blend in with legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=how+to+make+your+text+bold+on+discord PDF link annotation
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5d97d6b15672b20621e11c023a0a5070/pumidapepegasudadexiku.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/werepomepavarafug.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/lavadisalofonesam.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610d185ab41f9---bozerat.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/874f97332a69220840588f9da648e27d/73336134571.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/72665ccc4d80376f9c46720236215dfb/16645419264.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/177160cc3f0b29e2988592290f6ab0ea/35567139074.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/904slf1ubkj0cfkq54qnbje1gi/gomol.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110ad961c033---sefilatiran.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/tebafuzuxalujomit.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/a5ek6af82hbknm88d1nknqqel2/7347549313.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/porupebanew.pdfIn PDF document text
    • http://armanetti.com/images/mipaxidodafigonobik.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4a392ee7594825c04f4b9532a7c04e76/kotomazexoga.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210607052420_2114807800.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/1530621337.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090fff15c53a---dozasixugaz.pdfIn PDF document text
    • https://securitydm.com/slicice/file/33122394221.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/kurizeguna.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d022228083---jowobemixifapumakalexen.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/vuzenaxomiradofapek.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/vaxirusazulopilofodu.pdfIn PDF document text
    • http://master-br.ru/img/file/sotofasugemalozezotato.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9860e82214---34806151923.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_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 11156 bytes
SHA-256: 014e9f73ac73a34a2fd849320094e6ab1fdae2ec29c1efee3646fa06768e6a1f
font_01_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 16248 bytes
SHA-256: 5d68a22218e5e78c8a01710e5cc4564dcff2880392ddd84a6cee12eb3efb2926

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