Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e701a193addf2e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 07:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 565971d4e0f3931edba16b5a13b3dd5b SHA-1: 27a47a65636c2945fad7a835d5c6457b4a8d167b SHA-256: 53e701a193addf2e7d14f1dd1c60c23343877e72e60ba190dfcbf47d8a45c988
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those pointing to compromised WordPress uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=present+tense+of+ar+verbs+worksheet+4+answers PDF link annotation
    • http://canadanur.com/resimler/files/pubek.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5d8da3ad5ecc5bfa88fcabd3d02281dc/7198210830.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/jirajir.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/69428310998.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/1ltn7i9cu7t1qe1u2r0a1kant3/palidabobiniwimipapiwadov.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/26197068315.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/pamegigaxovegemakodepuf.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/wabama.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/55860055562.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c7e80ce87---79742788372.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/40415715479.pdfIn PDF document text
    • http://giltmorestukko.hu/ckfinder/userfiles/files/noworaranokifalewotekawen.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/gituxazokagixokafo.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/fofivonop.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b46d5a7607c---34889764815.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/086be5a8434218d800a94c3678ae51ae/gewozukeva.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/4163671239.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/68100275167.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/57141367268.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/gikisisirofezovafaw.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/nutili.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/zeded.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/40623339314.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/41903582851.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0288796001624535339.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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 17916 bytes
SHA-256: 6ec22e8357afc3e19f3e63320c811c375992da44ff36f71f876618e35af23bc2
font_01_sfnt_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 10636 bytes
SHA-256: e311a30da44184da87deecd22437632945562457414bd059d49ed9555c9079e9