Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdd29e6e4a27b26…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 07:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33489644963adbcaafbc7bd826cb43bd SHA-1: cb218c3fe982d22043d4bf4508dac8cae09d5abf SHA-256: ecdd29e6e4a27b2636bd08c830b9d0b31a475c7b8a419cb154dac0bd24d8aa52
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains a large number of embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'utm_term' parameter in one URL further suggests a phishing or scam-related lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=download+among+us+hack+apk PDF link annotation
    • https://12shio3.com/contents/files/32794691101.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/gisifatofafumapidev.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/midadesobu.pdfIn PDF document text
    • https://topupdana.com/contents/files/98208584672.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/zapopulapoxokemobow.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/91064728777.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/vedupuj.pdfIn PDF document text
    • http://cke.hk/userfiles/15426948932.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/dopiwelamu.pdfIn PDF document text
    • http://primaneighbors.com/userimages/38296370271.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/26446136509.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/pigenogixidagimani.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/30216438846.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec7f99f5d6---38568231570.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/jatemukovimumufato.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/nojuzexuromo.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/jasapita.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/matexatik.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/7f94d571f268df80e8fe6e4328ea41c0.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6a9530f12e4ab6a928e888812c80567e/75932859458.pdfIn PDF document text
    • http://w-mill.jp/images/file/vamiguwamasisug.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb1db2b1b---74737682498.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/23203198291.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_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 18272 bytes
SHA-256: 2d59ea1e50fa4d20b7b5132679545821a6477b370c808196efafad3044fc64b0
font_02_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 10816 bytes
SHA-256: 420b467b98a8fe87a2d065b88397445975790f30216f2f22aa999386ae148517