Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a971f7d88e389d5…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 18:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de2e44a51a108695db1fe610e20faf92 SHA-1: 1ff4c5f5e4c8569c4824dbf617ea61f8578fda38 SHA-256: 2a971f7d88e389d58fedd9bfc46c4289d345cea69bba5a7f6db6d276663d3c6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure suggest a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=pdf+compressor+offline+full+version PDF link annotation
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/17226564810.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5848c8676---47314003281.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/rufiribudexigikinavoxin.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/bikus.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/10856608421.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/muwekaronexusekaf.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/3628342142.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/zedafusugaludojemafavexig.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kabemugegugedipivogukonot.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610392069fec6---51477585143.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fb36b6b57---zobezokanej.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/828b559d9892e96108ad93f37345625a/wiremamaligewuj.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/dac59441fd8c94390c6ddbecbda7512e/dinometilaretopitupa.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/fopipedosu.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1629048116.pdfIn PDF document text
    • https://telenovella-bg.com/files/62341975158.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160819e66dea3e---43944150532.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/38879087621.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/rigawomowejexijotu.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/80505744827.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/u0isgv8cv6nvo1i179374tan7g/totusikevibez.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/fipurebasuvefatapom.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/36262600693.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_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 16988 bytes
SHA-256: d62e1e59a3a2191d531efa128d1e299815c50b54e7394a76b0961cb5047b9dae
font_01_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 10688 bytes
SHA-256: ebcb5064124ecde2ddfa4bd371bf8baf292156184c95d2d902c55492ab32b115

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