Malicious PDF — malware analysis report

Static analysis result for SHA-256 82acbe4d9261b314…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 12:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f0ce425bbee5a613aa14fa7c7272a4a SHA-1: 063c8d7333c235212dcd061a8860afac1744f4b6 SHA-256: 82acbe4d9261b314281736ec8fbb0e7c95c712065cbfc0135b87c26f694edaf1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit user trust via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=radio+app+download+apk PDF link annotation
    • http://zoekidsworld.com/userfiles/file/gedazamufujux.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac402b11d3---92768630729.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/jijetug.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/29030134414.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/wutibagonavudifev.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/54bfad77f637b4fcc2cdbe6bb5e7286b/39737802972.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/75695971681.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kogojufimused.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/vagakur.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/31838603.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/88370450663.pdfIn PDF document text
    • https://medpressa.ru/files/file/vumopafokikatukubexuk.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/64311765981.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/wizifajolek.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1a98528c599e78df8779862e7bd343e3/8103817597.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415a4346041---gubojosojatat.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/nojavafamimezaduzujenudag.pdfIn PDF document text
    • https://agrando.cz/files/file/zaxuvoxosiwo.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/tujukinikoxagawugab.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/dadogevagobotiziwa.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/vosilo.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16322968927511.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/81194034226.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_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 17536 bytes
SHA-256: 0a14eef8cb029e5efd02bc37ed0e4008327d36a9174100eb9b1361eea9886980
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10112 bytes
SHA-256: f10c6b92dbbde8e2d624fe9f55dcf129f34421f744128b046cfa26857171c8b6
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1