Malicious PDF — malware analysis report

Static analysis result for SHA-256 1386025b57c91d22…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 13:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd4f70268cec1a09a55b485e543b0701 SHA-1: ed06ed4875695de2ab75ea533b7edd1d208ea2f4 SHA-256: 1386025b57c91d22357d78d46dcd5b3c69f6c656154bbe554d52f6ee57afa5e1
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e668ae5fce1d8caba483f6b761d17e31/54794633283.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7ef1vm2o3n1btvgc0k2n03sdbm/40699336016.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/binetofokotimituvera.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/wigugitiredolak.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/89a93e5f31fdb14298198b5536205103/13135459184.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/62215455759.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/bunaxu.pdfIn PDF document text
    • http://sb-78.ru/files/file/gilorovezakijiv.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609404288b996---kegejuvis.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/96641024577.pdfIn PDF document text
    • http://idcla.net/upload/files/katemoxesesixegub.pdfIn PDF document text
    • http://bptramptour.pl/files/file/modiled.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/59921990219.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/13361783415.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80f38d76b---94319668304.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/67074020472.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6cf1b66442e58970a3aae47b89fe6715/vazasitowagatolewabap.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/5c89d3990b9c36a5531275536e8bb0aa/52183356650.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/gugabirajesomusij.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/5044839669.pdfIn PDF document text
    • https://ka-base.no/images_content/file/linuwiwedunare.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad98705fae8---genipubuxibon.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c6c40da4---texapido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fraction+to+percent+to+decimal+worksheetPDF 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_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 18288 bytes
SHA-256: dc70bf224a926e5d6d0a9fc7e9ac8a2202ea3c74d5a7b82a6347e1fa1d7ee7e3
font_01_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 10932 bytes
SHA-256: 824fcfade2e8f2e3a818ea9e7447e4b998cc9511baad22ddb00d885f404610f2
font_02_sfnt_off00011da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1