Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c717673ee9b9cd…

MALICIOUS

PDF

84.5 KB Created: 2021-09-12 14:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e9dad1ec020566a4a3860fc8a08d34b SHA-1: 40af68896a95c940775b66db80e5e6a8c93e1fee SHA-256: 99c717673ee9b9cd40b13c52728079a2a70ff21629bae581bbd5c0cb68468090
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=nexus+7+reset+button PDF link annotation
    • https://niboparis.com/upload/fckeditor/file/1631230242_1.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c5077a8d234da418d3c95c994e872578/59589684698.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210905185140.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/67fd51d365f3a543e5ed1b8a9ae2118d/59948146097.pdfIn PDF document text
    • http://benetalent.com/upload/files/merenokaretan.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8acc1b1f1---81532651615.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091212230788.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/kobikekopofivixadile.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/38541858061.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/37870528420.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/39543012668.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109102116522645.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/82798277418.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/9348693606.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/jemigir.pdfIn PDF document text
    • https://grouptm2.com/contents/files/96772519767.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/80274921530.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130335238af7---dogujoma.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21090802004480679158mx0.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/dijutamefedixa.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/77989336368.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gixukero.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/tokefoloxupafala.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/zugijizoli.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/33968943953.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_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 10168 bytes
SHA-256: 33ecaf88b453604c47253db1e9f7427f9f0d4501c0fff34f410f8c197e8fa4d8
font_02_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 18792 bytes
SHA-256: f9593fb9a786a018561fcb276842226a363b711096661ddfa551ab624e3a3009

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