Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92363b0dbbbf57f…

MALICIOUS

PDF

89.8 KB Created: 2021-09-06 00:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50c0fd36094d1aa2c1917c5edba05db1 SHA-1: 2c175ca73f516578b57213ac7e676b52e70db64d SHA-256: f92363b0dbbbf57feb52cc31da54306957559e15283d3d5f77557c3f4196aa8c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a multi-stage attack likely aimed at phishing or distributing further malware. The presence of an AcroForm button with an action trigger further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/2514vqdrnncq7b4elilssb6dv3/dozikeporazovidetenufor.pdf In PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16134d9aa26eae---xunubokokoxuvumaxulevoxid.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021053110161173499.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/filosexevutixaremevil.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/gedajenurokagugedawob.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116780c54aca---gufafobenelas.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/77435682292.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/24355734656.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0cd49f0aef7c233286170f4d02f017a8/jerodirutekuful.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/37694643850.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/a34cq2r4cpc14njg5j01svlafs/22905810437.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/lln0lqjv4c8d63c98cmfiu6e86/44425482596.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/finawe.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/81023406989.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/61495457319.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/44410082281.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/n8bsh4ue30ddka6vjhr509hrk1/43750100290.pdfIn PDF document text
    • http://sartor.ru/upload/files/guwola.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/romijawosunaxedu.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/16741872799.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/edfcdba865a565929c336752b731108a/wivitikojasadapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=16th+edition+of+the+chicago+manual+of+stylePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1bf1c2679ce87490dc61af67aee0d3d3/1375110020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 18284 bytes
SHA-256: d53273b9a7dfbfb256acf6d41ef7b6a7e275f57f1b89fbca03c05cd5fa7e1a66
font_01_sfnt_off000127e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14000 11160 bytes
SHA-256: 73e8f64b660b57c1dfa82d468cbfa9bc595b5ea8b8a7c2163c4357069cbefa76

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