Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd2462c87f55f39…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 08:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1157b37cccbb75680421ea98fcdecc7f SHA-1: 225e108a51e12f1efd18779d782d134cf761b914 SHA-256: 9cd2462c87f55f396394f00dc8db3a8ad1241da7055389646d41b2d0bbfb9593
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://smidgel.ru/uplcv?utm_term=warhammer+40k+tyranids+codex+pdf PDF link annotation
    • https://soportedevida.mx/ckfinder/userfiles/files/pibobek.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/69957033830.pdfIn PDF document text
    • https://techlan.pl/files/file/61809234294.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c99e26cbe---ditawodomujedugela.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/55337368652.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/75360062283.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/paduzafowoboxilisoje.pdfIn PDF document text
    • http://elpijisystem.com/file/dokuniwuwe.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/2191395350.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/zuxerorujivedevekak.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-3/20210903132706340519.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/muwojopijizumoxalekulalo.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/50270073509.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/36137529774.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/6635884243.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307c998ccac---simotukub.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/57909279543.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/xisavexowumujimulabosuxim.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090435948_299421729.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/vamadefokevubugosusabo.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/tozidiburesawufi.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137553e1d6a6---rigapezewi.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/wivexuv.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/48114015919.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/71411712291.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/94268131251.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/91808448065.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_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 11340 bytes
SHA-256: b8886b211c0c91fb9daeb80b72e16df973cc19c4d4dc5de15940b1c0ad46bb14
font_02_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 17168 bytes
SHA-256: 350e177510b37508522c8453f636cd567628d89228aaf2e5002bebc1b74cc961

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