Malicious PDF — malware analysis report

Static analysis result for SHA-256 c880ecc8b72673be…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 07:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01567ffc513f390a2a3dcff459dc96a7 SHA-1: 711ccce4734ab5e10a9254f90c51f80b434d841e SHA-256: c880ecc8b72673beeb8f68d8315ec47d09e1570710d55e329009f3f0acb7553e
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous URLs pointing to various websites, many of which appear to be compromised or disposable, suggesting an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://emilline.dk/ckfinder/userfiles/files/56985874647.pdf In PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f46426157d09afa94dacafc9652ee210/85835840208.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/36588263236.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608782e3ceee7---86025574806.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/qpju4gorsogh72f31of7skegq9/51908455121.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/14422616815.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/14476651855.pdfIn PDF document text
    • https://onlinendttraining.com/files/13537687118.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/p871jif8auhid9g9bvhe77i0uo/jaxiwinamaxajezekalobor.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4019dc99c6c4aaa5e4bbb6745afb2471/62446233756.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/70837707651.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/38371299456.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/rojibajogobosabunazeg.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4e469674b24796ce3ba0d96c61b1adf/3417221944.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/kovuzimiz.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123de79b9fc2---61703202889.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/jofunusi.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/9936491565.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/46527774178.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf7b883e9---xokofoxamazi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6aq930q4ns2t3iuib6aa1i6dg4/fomofegaw.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/6434012140.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/95707443389.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/496a13e2dfd2169d43f59550071db7cf/boveguvup.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a7bd316ba05aa6e7bc092562304aec29/nivimawatizatagebogun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=comparing+real+numbers+worksheet+pdfPDF 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_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 11396 bytes
SHA-256: 8c6d701a23be3e67fdfa2ce45309acb6fc7d3225ae11ac0c68b2d49a4ee201f8
font_02_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 18424 bytes
SHA-256: 12d9dcb46cbfde00cd67511a0ef84acea028fb2f99a46553f97ad62193c932db