Malicious PDF — malware analysis report

Static analysis result for SHA-256 6889717419e67504…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 16:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de12c8490690f221a33f96cd0e212f44 SHA-1: 6f0f4a63205be8dbaa2f18fdfdde972a501ebabb SHA-256: 6889717419e67504b165515d5335ace40210de42572db14ae6d5774fc69a9581
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 a machine learning classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics strongly indicate malicious intent through the extensive use of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://hattingtoemrerogsnedker.dk/userfiles/file/rojawufezajum.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610689c81aaf4---widijepatigapoziketilav.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/49371995740.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2f30fd5fef6df50b0d0b20850ce5c142/biremapugamakowamewajo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c458ea77683---77341931533.pdfIn PDF document text
    • https://ms02bet.com/contents//files/jemegeturazugup.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/13818864200.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/seloxinixiti.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/24138603704.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9lc3kkkg56oh5ubq70hkfg872v/84860627645.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/a41bff4a255bec26b730ca0e795c8c8b/ziwelisamez.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/51335757926.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/jipovafunorelusowupix.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/70021904556.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ri6kp84jc7tpk546f3h1j8q55p/dezivuvo.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/ralitawokufup.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/gibaxonalukawiwuzij.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/kubenosufewa.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6552e713cc38b524ebf6845febd32322/disakaforutavudojirop.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/murusifedesipatabolabewe.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/pugunivafoxujexagaj.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/wowavexigewubafakimon.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/62681427274.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/8fb53617a43eca84bc8e722d6a772d0b/nevidinuz.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/67831397074.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/pa3dtvpkulusuloe4om3c29oae/31425763234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=finding+the+gradient+between+two+points+worksheetPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5cb71cfaa058a563300ee97c24283156/ginikaluwadelenoxeda.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_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF692 17972 bytes
SHA-256: 3fbd187913b25fb3100460c9cdd156e67e60b1b3781245c9b2db7be20e71457f
font_02_sfnt_off000125d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 10920 bytes
SHA-256: f70e1afbe760ee5c604ce19fe585707ef4efa3d4cbd91f5e001b580772762d9a