Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9c6e4ec81e50e0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 21:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81df83b65aebf1535f837bc0a4467b2d SHA-1: b397a42c8394beed2cc50505ba533529a4f391b6 SHA-256: 9b9c6e4ec81e50e0349eb3bb5bdea11f471957a29df9efad3286906ce789ad1d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous URLs and the heuristic findings strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://derechosenred.org/aym_image/files/78273033691.pdf In PDF document text
    • http://sarkar.ie/userfiles/file/xiwixuxikuxepavixudemoko.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/notuxajex.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/97108945090.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/fupukegetidakurig.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/98260591749.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/mabevinawajisesagi.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613924c796599---konujixaki.pdfIn PDF document text
    • https://phm.vn/upload/files/wixowiradozuzan.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/muxunawabono.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/vizotedugirelojebavi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c35046df7---totalejofukukikufoxenero.pdfIn PDF document text
    • http://360global.ca/userfiles/file/31354473339.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/guruma.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/7252447411.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0c4fbed6331ff0fe54aa3edd0e32c5fa/pawuxemoxagenegozi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/n7mdj3ql5b24miheodguvdr9kk/xinenib.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/kigufoperimuk.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/39776441527.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/vojesosofofolojew.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dudedirabulalokimunuge.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/60193131224.pdfIn PDF document text
    • http://forti.in/userfiles/file/521134717.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/luduroxozuvewowuf.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/69997412186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=group+text+app+iphonePDF 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_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 17484 bytes
SHA-256: 8228fb245097a36d1308f6e9ab5de42afca5aad0e5e7646ccf2d6e7e9f487fbd
font_01_sfnt_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 10376 bytes
SHA-256: b3385c62977486c3e087554e7fd8823ab5ef35f5b0ea287334408fceea8d0b76
font_02_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1