Malicious PDF — malware analysis report

Static analysis result for SHA-256 d551b71c794cbae0…

MALICIOUS

PDF

91.6 KB Created: 2021-07-02 07:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 84b0f879cbfec0ccfff625b7572316b9 SHA-1: c67a9af0e94df62a86ae10eb274bb765acddbbd6 SHA-256: d551b71c794cbae07c0a712ea2ae0871db07b257f085adff3d3a88092641e083
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs, such as http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61806d9c5---5069636770.pdf, are likely intended to deliver further malicious content or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://boumqueur-edition.com/upload/fckeditor/file/doraxovenadita.pdf In PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/90918205097.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a354897784a---93247708202.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e0166b2e8---muporijufegejemivemumo.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/nedaxamuduw.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc0a3f7b4---42057443352.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d356381dcac---wolipiwologakovobelezob.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b6a539c1395bf7d30039d76d0c64d003/dadadoxej.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/sidalowufuvexusuzobizujes.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608113608f300---47427259417.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/0efd65ec6d16544a5a7013ce63749b5f/wazelugi.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/dorepizufegimab.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/78331758218.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/vaket.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8010ae25b---rinikikapuxitadid.pdfIn PDF document text
    • http://afslab.asia/upload/files/88189948936.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aec7a26c0---45489734887.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-06-25-05-03-22-PAeZCOFa.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/xiduzonuwufagoguvanu.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/90503740772.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/18205815946.pdfIn PDF document text
    • https://castel.ro/userfiles/file/24234850577.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8da528fc6---kukiderinerojiwaxasexe.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6607b039c828fa49d529b94f93958c31/jidajekajowol.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61806d9c5---5069636770.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/7106221752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hold+the+fort+idiomPDF 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_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 10176 bytes
SHA-256: 22ee76940af2001327215453f72627cde457042eff9412fe976f7998926fd254
font_02_sfnt_off00012fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 19424 bytes
SHA-256: d7a5e86c92340afebdcff830ecec1623ee017742031d2b230d48c6197bc09f78