Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9b87bfc0931745…

MALICIOUS

PDF

87.7 KB Created: 2021-07-03 14:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f08c4e921d4a469c830174e1e5567ad6 SHA-1: 8cd7f23212a30c59c56fac7714347e2eb99cff15 SHA-256: eb9b87bfc0931745476d6f5571b52fc843847ef3c1e4a6a3ac28b2c174913e07
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document's structure and embedded URLs suggest it's designed to lure users to external sites.

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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb32232079---domafafibuf.pdf In PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8afeab9f---muxuwigiwadi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894f7460fc2---zabedaguwasewovubi.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7ebd6542c---bezebiduledasi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7a5716ea9e231eb56b6479d36db6e069/20115050271.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/bijorokidi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160869ade350a0---nofafasa.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/dugitolitezupis.pdfIn PDF document text
    • http://gabortech.com/admin/file/88832657283.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/21806393621.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160acb1051b579---39088847548.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cf2b96090416c1d4dd892f1634f5e09/kebunaluvewasabapapax.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/j0hthvu6og08ni4d21qlh13vc4/42356160298.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7961f7d1f78fa65322608fe1a64e57c3/39172961859.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/jatisizivonixuxap.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/49693595660.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/25719808265.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/47896147383.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505022346503631.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/vunuvexagofu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/jozugivek.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/60103251448.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/66045542432.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/dipalinumeruxiji.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/27008d371939f7529cbdc86525650d37/wisufewojuxif.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074615b9d1d2---rekegujexapumufawusop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=easy+strawberry+moussePDF 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_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 10452 bytes
SHA-256: 4048e70c0cc838255aa574dfdb47467bff3417ebaae78d0fd3c1f6d432559d81
font_01_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 17004 bytes
SHA-256: 361e5f74bdaecb45a0e99b80e113eb0a13935c7c500aa3ec657988d636ed648c
font_02_sfnt_off0001397b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1