Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d45a918dc3631e…

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 12:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5df6db6ad641dc84b1de388ce580c2b0 SHA-1: 39f9cd81dfdbfa72bb58a08800439ecdbb5192f6 SHA-256: 42d45a918dc3631ea3321b84d29d1b48e13017f216e0982018e7c6ddd55237e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external websites, with several links pointing to compromised WordPress upload directories. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather as a vehicle for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://almoheetmanpower.com/public_html/userfiles/file/puwef.pdf In PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/gumorileruzozudosuki.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/84892878653.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e4b420fe---85077909329.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7a68bdb2d8c1b9e276b88ee343b89f12/lifesi.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/baxigamatuwivus.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a703dd4a1e---tifudofasulepixaranepodek.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/776a5c19a295ad995f2560db09e0fbcd/xekizidilono.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/48731053001.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e54c87b0---18666545356.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/mabajugafaxunitidewubobef.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2dd21158f453be05a24f0c19fe62ae8d/kepunutoraxipekutelato.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/wunonoxufija.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/vafage.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831c0b48629---27093361398.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb0b81fba6---33225623949.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/99590188681.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/4a2672c3e431631966c4ac6e959a0636/93808789764.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/gajexovew.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/p0a833vlr93ijki04jko8m30if/ditijexedolozebaxulazix.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/bd512b04f3819d6244b9409877a78187/gagefafikidufuxidelifobi.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/ruvejupi.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb83a2794f8---94312887314.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/a3jn4il736tbqt6eapjfe0t9s1/gezurigidivixujizupo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/sipawefasegomuninuki.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/72b0d296e9b07cc278205e1cee002db0/94165099282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=positive+mind+positive+vibes+positive+life+meaningPDF 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_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 17680 bytes
SHA-256: 8b7d3640aad221f159c94c6483d816a794b0132de18bd3ad673501c34fb56a38
font_01_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001422d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422D 10948 bytes
SHA-256: 2206651f46ac1b7d8d8a5fed93b8ad73d52de82f8aa36926c3ffd5b274507bee