Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb3efea60ce5383…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 22:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93dc08b3f42a20deb2a166809267504a SHA-1: baaee1e4d543ee3d8d4a8ce8c68e8614a258a47b SHA-256: 8cb3efea60ce538378ad6d5e7cb7673cb057faa69f27d4369455649376e2d13e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ddf6f39db---fekoripasarelarakisofo.pdf In PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0cf8386905cb4c923a8e6af688c2681e/2488721113.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/totobimubipovu.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/94031758746.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392757eedb4---lobafagifezitipixefut.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/3586879377.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/rinomoporabuwisagutev.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/zodokonutupemuvajewa.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/2340330382.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/83160361258.pdfIn PDF document text
    • http://etre-belle.su/images/file/gutelaxowelilop.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b9d22dfd---44654339347.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/n45g4a4hr5v1qbq2b6spduv68m/82754815653.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/kopevajulisapi.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/gusaginotujupesa.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/lasodorizaxamuz.pdfIn PDF document text
    • https://quizai.com/uploads/files/zalidimimegif.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/48553076102.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/27089427305.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/87664340972.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/dekeserusov.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/87255263757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=epic+fantasy+apkPDF 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_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 10264 bytes
SHA-256: 243e8656763bef3b6a7fcc7432a6899d176b1243f0f155f5d7cd829dce5b0d02
font_01_sfnt_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 16920 bytes
SHA-256: b4c42a4cf51041ade3b8ede1e45cd202bc9af206c25efc47e15c219f67234782
font_02_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1