Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a0435e131b31d4…

MALICIOUS

PDF

89.3 KB Created: 2021-07-07 13:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c49382c1e3e73c9eafab2fd8658ffc16 SHA-1: 2561a9e49618d90d4c2ec58275126d746bbf82e7 SHA-256: 52a0435e131b31d4c8094766fd21612127f4c5ff1cb8c2a3676d5045ed2970dc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://shipsupply.ru/userfiles/files/rujam.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/0db7ef3a18e60f5028546ccbbc14ec61/35140188747.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/batewebaz.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/xukunubegabez.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a7a3c61c7b766daa697d47bb872aa3fe/55409142728.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/22228482214.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/98mre5288g2gmvdmq6p0lkn98j/88672528856.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076695f70ece---tipapaseniwaj.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/pkp6gvcltg3nv0287m4erdv6n3/23419259514.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/lixafowalo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0afb155f24---pepapuxaxiritatabem.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/leganizixomibaralurez.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/wajebolawanuseboxiginodel.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/61900388284.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e6f7f33b2d8415a80fd03b01e9097ae5/41073171803.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/tavekegoso.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9344aea3f---selizejixewu.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/medinawop.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160796cd541bfe---duzukidokikarad.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/41858627382.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/63595729547.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/12365708884.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/44618419756.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6e90bab9557fe547fa3af83786e5d146/76833585560.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16077e3cbb962e---43326398003.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8a61f9a74aa71c451a9778d6c38cb247/maxilijuvatiwukixuvi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/40220409150.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/92127273250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=work+and+rest+hours+as+per+stcwPDF 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_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 16900 bytes
SHA-256: 60f22bbc77ea2a71c197b458f6bd4362b86edc54d615d6642370a759c6ebfbb8
font_02_sfnt_off00013d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D50 10744 bytes
SHA-256: fc2bfe940314277bfa3cc34f28aafd58b8bd5c42c0d1d1c11b2a1ef8e83c7ce9

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