Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4873b06d05dc38…

MALICIOUS

PDF

90.4 KB Created: 2021-06-28 20:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 07f54dd44dada6e24c6e105dc1fcf391 SHA-1: 7c5452b80e54dc4f031a17ebf8f0f45e8b89910b SHA-256: bc4873b06d05dc38e09b37804c60428bec8f3de572a58a154ead1f7aef03029f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://huntic.ru/uplcv?utm_term=epic+battle+simulator+android+1 PDF link annotation
    • http://reelproductionshd.com/userfiles/file/laguwiwogubox.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2ca6464836bbf0e4d0923dbd0498d1f8/90396971300.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/refotovujukakarosokera.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ch897b03vopng4s1pfptb3mmts/tafopazalagaxowojemiluf.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3bc989a2c3c4194cf2468a525c34cda9/dapenamer.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ofh9ndnuieo6lpdipie3thftcr/54340306891.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/zuwebumamigow.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b172ec67a4---68672091623.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b24188c581a---75021207197.pdfIn PDF document text
    • http://russia-ex.com/6808935895.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/70301543868.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/naguvivuzevavufasetaxoba.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b87047ea1---11455130560.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/54158823f4800e135d473fecadb542ab/sofonerowibujaxazeba.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/d52vv0crvr0n9msfkudd75qi2e/fabas.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/86e0a1ffb3d367cb2d20497bb4e02275/relorogupitolevutoxisofof.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/vepugasit.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/45847664176.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/rl2kd3t9c2qe7vh9td48o7dto1/datanofiberepanunej.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nul56d0s9sea43qpil69mgala9/bizafivoru.pdfIn PDF document text
    • https://bselink.com/userfiles/file/26966613955.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4d39888bf347ca5e07bd2b31f2a39ce/13939677958.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/laburuvuwe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 29740 bytes
SHA-256: 1603c2247427f39a3d63189f663cc025c433ee465514e0773d1e2724760a17c2
font_01_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 10948 bytes
SHA-256: f7d6570e4816b20ca0e64e315ff87e73e3404b61b44d3b26470c55ae6a2427de
font_02_sfnt_off00012ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 16076 bytes
SHA-256: a788292cca142aeed5da50f6fe930e2a2735a94866157f12b187defed158ae4b
font_03_sfnt_off000143cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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