Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b0797b33489383…

MALICIOUS

PDF

87.4 KB Created: 2021-07-20 18:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7035f0ac0df8037141bd3e196ee32bcc SHA-1: 23bacf4639bd74536d337a9a97de32f0f6f8258e SHA-256: 17b0797b33489383ebbfb47a8d968dbdb1fff630cb8754065d666bc7d17532e3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs and link farm structure suggest the document's purpose is to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://quatang3t.com/upload/files/xobaxuj.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/0ca205f9b0d0efdb46cab6ca2d02e24a/58023747849.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741c866e886---kinafanewutokupale.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160add95ad692f---5316807066.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f41ffc93dab---waxulorusedasa.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/ziletepo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/86ogo6unme12u3bo6uupugqlm5/89677330946.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f43be7fbb91fc8dbb9ad9d7e02668413/supoxenegogetawaxuveguw.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/12c8cc112dd7fc4ff1a4336afb8a7945/tijurajiravavoxe.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607399d9eff7b---29805326502.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/gokogeko.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/75869232927.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/36bafd655b1f3856564cd37b835f931d/jebuxebidotumepa.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/78576513327.pdfIn PDF document text
    • http://atek-ent.com/upload/file/wumujinasukepibepikiwib.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/21084655939.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/5596d785b4367127f4bb34cb3427f6cd/xegaketapunuzajabije.pdfIn PDF document text
    • https://kenadong.com/contents//files/84558610211.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6081f62198---87117528037.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/55886133988.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/vadikiluxunolajubojate.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/cfeec86ddbcb318f2dd474ee2d6e25c8/86024893016.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9160aa4f33084fe9e4a08564e64bba78/92899120934.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a080bdb83---40611655866.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/kk2foj19a4ahaivru9ac33irj9/wuxivabolafageg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+red+fox+clan+pdfPDF 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_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 17440 bytes
SHA-256: 0897eadc0fdc9ace97b9dd327022f76eb2f92b7d6e54c72e9db9282a6d798c39
font_01_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 10424 bytes
SHA-256: af87098a8de83bd709051888954241a7aaac4df0ba7d01c12b68a7dde8db98b4
font_02_sfnt_off00013822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1