Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f9e7d1ecd6cb64…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 00:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1962dd7b57c986b37964a2aec71c85be SHA-1: fa8566007ba828fb27ec055f6a5cdb804556e313 SHA-256: 42f9e7d1ecd6cb640a33ce37144e96d614752d2a58180125ee42463e96a13428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=kp+thakur+english+grammar+pdf PDF link annotation
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f17ef6d952fea520ef77cc1af1f694a4/51665738412.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d3351d002f6a8f3fc2054d8c64611fcb/9627458125.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5dca350087f0dddef0752bd83827c1dd/xebegipojefabixiwofi.pdfIn PDF document text
    • http://soupworld.de/upload/file/86091813127.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/reladekejolebupidonobemo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/olp3mhd7kfo0ro7qs7n8vj0un5/vaxezifewenibutibiwo.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/28768322939.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/72264241886.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/aabq69ni67apaq05p53n9jbmm6/71782079922.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/88681925766.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210615024303.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16030d26c7f7006c9c3e97fcc6abe0a0/fikiwijude.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/2545245148.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aa4b09f3a650699da2dfe75df525f1bc/disopexowedonobi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/52t2ug8rard3b3qqvhv8tq09v6/winob.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078a7eaec1a2---rubokemusegobebeb.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083b5b19dd51---kajugobofijoruzagetatuze.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f714039654d1f96ca66ccb16e23258f/rezewedojapigufe.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/40717eee5a594a34aa491f0a86b181ab/sokim.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/soroligamu.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/200iknvinhab0lpb7ejm19hnc5/78001899013.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20cfae8b1---91008454735.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ef4657d915fa70564ace5f41582436eb/44904214068.pdfIn PDF document text
    • http://okvin.org/userfiles/file/32646603576.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ecf8f2a9ee1---xufekeb.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_off0000bf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF55 17184 bytes
SHA-256: 67a34bfa400dc98c90742b9356b85b8de1b145d1869ac1e2dcd2d8e8cdad57b4
font_01_sfnt_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 11008 bytes
SHA-256: c8c1c2946a337f989490a0bcb76bf882cbac0dcd206e08c72e44ff0fc8028d04
font_02_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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