Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d14f3b7a75a651…

MALICIOUS

PDF

95.1 KB Created: 2021-07-16 22:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 947fe0f40e646d1a1ba589b3aa13ee29 SHA-1: 66b2cf8a853e8c83b9b87d58b78d611ae5ede7c2 SHA-256: d2d14f3b7a75a6517b79b0febc4eb8107ea3af6bb4b943e763e5304423089bc5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://home18.ru/wp-content/plugins/super-forms/uploads/php/files/290eccd38b6f5fdbc22fa1bd10df41be/burapebasupizariludeke.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/onpvjugd3mi2lniip8lrdcg9av/25406113254.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608c1f5cb734e---menalesumuraboxujixos.pdfIn PDF document text
    • https://bombapin.com/calisma2/files/uploads/82860618549.pdfIn PDF document text
    • http://asustainable.com/global/file/ranisoris.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/piradozufijugezowid.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/sakusamelokadesor.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/rejilogemugadumolozulij.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608366325ea38---fevesusifowigesoteka.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/174eqej071oust7gmkfvk2mjo0/tedipuzifarujizonixivufi.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/kenitufokamela.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087eb81005a0---48481478235.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5c34dbf60f911cf7356d8d24a158f0eb/88251405564.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000b75b870---80757925373.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/sotogolo.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/nuwazovalizerogidubukudim.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/25983260433.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b971169b520---6161584384.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/13548261788.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/32768007394.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rrfenkk22rm1d4guhjq31flrk6/wodudidakutidexeb.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/kl60dcqqkb4aef7ue1fmerhf00/21937433304.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00e2890bc---72422303701.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/op7dhum4bm2ukuth39avkrso25/96465551018.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/sewol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=in+a+book+reference+the+title+of+the+book+should+be+written+in+italicsPDF 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_off00010fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB8 10944 bytes
SHA-256: 30652f03792420898d3eb395707fec054398b466b9ac80084b125167d8311a3b
font_01_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001412b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412B 17288 bytes
SHA-256: c2d2b7ee85356e84b9f65f52fcc96caaa9dffd58f7b64bc123d5f61c84782c94