Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b256c8db2707379…

MALICIOUS

PDF

90.9 KB Created: 2021-08-13 19:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 405777237d7644da4671b76cf1b1ff78 SHA-1: 6b66b9ed677935c8df5d8fbeb54a1ed325ded9bf SHA-256: 8b256c8db2707379cfd1d64285fde118f524b9b7ed0ee49309795e9f7bd781de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites, likely serving as a link farm to host malicious content. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833116c49e---84330637303.pdf In PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/do9nc4fnuqdgu8pjnrbrgvn0f5/60831452445.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/oh1j5jme53d587htmpfjuci3m1/niwasewojifit.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/87eo3npe72tck5u57531dkkp43/jajivanesimamoza.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/q6m94kio82sa0am08jbl3ct3t5/6865198972.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/81465368927.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87fbd5c18---32682289539.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/gujiladekuwobudiponiviv.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/lemetizixage.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/vakebofesanadawudezis.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/devezevadana.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/68070094154.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/65704654500.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/dakexug.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16109f0c9e726e---gigobowoxivuvikozos.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b4167b19175---9535582664.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3ec1d499---xenegogalipotelusubebot.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wexexisedege.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f173f86ebff---21274343777.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/59199476754.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bekedibuli.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/wejosuxuzovamabe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8ba855b0---dalebibexajamiv.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/mes4f4ec50ns8eijr6n6vsfr2o/18355114398.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lt62shr08n6tivf1q87ceiv5q1/pigijeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=yaariyan+movie+download+filmywapPDF 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_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 17132 bytes
SHA-256: 3c990117b883630615567760254ff6213ce7bc5fd42e2fc0bbfd8636500b9644
font_01_sfnt_off00012cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14511 10640 bytes
SHA-256: 645804b3bc42e09afd3d5f8aad5b4b2a6d3c2477bcaa870229c7e68d51684ec7