Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9d4682a4721a17…

MALICIOUS

PDF

86.3 KB Created: 2021-07-26 20:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0676ba1e758266e6d7f292c0159f4231 SHA-1: cc94c7ca4cc7fb3cb90ea7bd08d1847b438ed076 SHA-256: 4a9d4682a4721a17bb69619ecfdf279d42ce58a5bc9346880c0c7caa565dfb95
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3af146f498bd06297c31167ee429ce65/govemizesegugidetubune.pdf In PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6c300731acd262eb209d753074fa2d78/pagabatabutezaxego.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/3356932439.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/gejejujewa.pdfIn PDF document text
    • http://parentini.it/userfiles/files/fanudefamadasemidunovivi.pdfIn PDF document text
    • https://keongracun.org/contents//files/jaxuwabipitalan.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fda1f4a0---96467116612.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/52k4jnd9lat2e199s26cjbnu1p/dasuzowupaga.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2dc3f238b---48183457246.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c060bd62cfa---vakijolasibosodumij.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/buwofo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fb017498eb8---dejazewowizez.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/43cc4ce17ccf31fac89cd64d3b13cf82/76635676869.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b558948401c---buximeborenukubirukom.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/50272126385.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/38775575547.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4719c46b0bf49c7017887149cacb4aa8/kakipe.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18022d1c55---zakujikavanezi.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/vixodu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/33226025914.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210723071028.pdfIn PDF document text
    • https://codecs.ro/images/file/78775538218.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/xaluluzazija.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/jomizovavoxoribidulagiro.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b02e5758b0d6e423d95b83d9c1c09959/11717625789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+update+summertime+saga+apkPDF 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_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 16948 bytes
SHA-256: b9daf4619e205c6e2b1f37261ae3bc95bf33c1c47f627454010813b1310f3d7e
font_02_sfnt_off00012ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 10852 bytes
SHA-256: 05ee076dc61d72fbe6ea1b69888ec9a6d862931a922636c1375afea60b94850d