Malicious PDF — malware analysis report

Static analysis result for SHA-256 68941c6fd04b190b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 18:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c62bacf0975bb1a2ba4aa7b6920cf139 SHA-1: 343a0dfd4a26525fd2db695dbfadd928ed0a2e73 SHA-256: 68941c6fd04b190bb802ae3d05c0693c8d8c0664542938da21c17f835599cb40
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, some pointing to compromised WordPress sites, and a visual download button lure. The presence of a link farm on disposable hosting and a specific URL with a 'download film' term suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=download+film+fifty+shades+of+darker PDF link annotation
    • http://webbuilders.com/files/file/56249392607.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/48949405664.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/mibijumipom.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/xuzexiwapef.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/52907076221.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/koxidejepukavonipudoju.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/56967628518.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134cff12c867---xovotifowujopeke.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/saxeserosewakiji.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/7259571274.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60323ed7d---57785582335.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/os329c0oh295uj60qjlp5bkdd1/xalusumugufazumokiguniz.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/wutikazalotavikepubig.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/malijemenif.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/87313741743.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/93225635098.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/wubuxajexivosebege.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/99962025258.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210913_061932.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/31276875085.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/tipasegatemat.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/72636921608.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/57388367264.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/17381737297.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_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 10912 bytes
SHA-256: 3f422bf31e5b0175e39030dd28cee27d2bacb1d7a93decb6a5b624f421240ba6
font_01_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 18820 bytes
SHA-256: eba473081fe60b8ee72158946bc0d25c6d2df163028f70b79aa15f0ce8342227
font_02_sfnt_off00012478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1