Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca5a1ecad2b1cc8…

MALICIOUS

PDF

99.2 KB Created: 2021-08-01 15:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 214ba72cd588ded6073a76f97102a1da SHA-1: c66ab07ee2c75b58f1b0802e7273d005f4f37449 SHA-256: 8ca5a1ecad2b1cc8d09120c539d4855a41106fe88aea0279a730f68d87bb8a9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ketchas.ru/uplcv?utm_term=what+the+bible+said+about+fasting PDF link annotation
    • http://sushiyaslo.com/uploads/files/51150747887.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/9005303126.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/dd2758eb7bce8394aa28bc092e220c8d/puxalobolubax.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/53888167284.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/35054790498.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/73370eml9ffa4dk09bohdpt099/xuturemaj.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d99f73da1---52605463165.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/pipifazexizekedod.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad59a3bc173---81317033560.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/7528939768.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021080109371659.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/47660d46e3c222093f92b29e590b1396/mupanevudesewumiviba.pdfIn PDF document text
    • http://garderoba.sk/images/_file/sodeboxadepujumijuru.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/lasolexexisufuwikirebuv.pdfIn PDF document text
    • http://sun-eko.eu/files/file/60524876284.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5ad3632193a3026c30e97797f5234870/zomafalepavuxutitiliferu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b152c03be672ec638aef6b2612d48f45/femofofano.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721aa98a693---1300925225.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d305499194---1842670923.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/10636843184.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/28830917841.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a418ff343eb---razifop.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/86762762383.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/fe021fb526ec2e03eda0e72131b9ee6a/ponosegelatadijoruzimek.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baaa05314e4---29089160943.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_off00012072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12072 17044 bytes
SHA-256: 2b6dee5c5fa2524786162f6bb908df740539495efa9ff261e641455e64f42eb7
font_01_sfnt_off00014cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC8 10764 bytes
SHA-256: 18693a42e7d9caae9105be07b6f7d5353d50a162baa3ed57421b2c90ddf91674
font_02_sfnt_off00016547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1