Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5ca683ebad1274…

MALICIOUS

PDF

93.5 KB Created: 2021-06-12 16:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0131ea9fc7c63da22af2ad0f6dc551b2 SHA-1: 05fc6927843be09e22a341e4fdcf63001072cc7b SHA-256: ba5ca683ebad1274a0efc1e5d1b10f1d3615fdda1bba11582a8586a2121a8526
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a common phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://krisoc.ru/uplcv?utm_term=anycast+m4+plus+manual PDF link annotation
    • http://transsnabstroy.com/userfiles/file/27344225484.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/41288095186.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/xinijefugulu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/12b36bf044043a0ec588fe424950879e/4870698440.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088337f9bfbb---66410546284.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609642f264aaf---78625218561.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/82687029775.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ba2916c5aca1331b8fd0e3b27de40de4/wawunasefijegagovivoranow.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/8984519134.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3b82c0e6---71611981857.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/68orb3bc40r9g7nh5lcdjga2tn/91309496069.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607096f07c5dc---ponesafosakivajojegodemo.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210609_055051.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2f66352a---rokuwanofopixomube.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923ee582ffc---kubuji.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/lorazajuxidenuwerunesego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4297fb4c705702632a2f407b426a0146/56454517707.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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 13744 bytes
SHA-256: 518daf5f56c034ce8186f4cb66df1e6c384d1104a7e0dda14d63cca57395aa45
font_01_sfnt_off000113a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A5 5164 bytes
SHA-256: 2b2f6982c7719c0285e1060e3903d9af03d4b613ddf619398a291d157ead1dd9
font_02_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 10296 bytes
SHA-256: 3b2fdcf110507fd3585f913ab08ce23fc9fe0767530f1fdccfd5ab1b1f7dc628
font_03_sfnt_off00014138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14138 11932 bytes
SHA-256: a0bfe5763af6c5fdc6709e16ee1b9acfe04d3b8a6026fe541b8f39adf5e23b67

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