Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7828194a11e70b3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 10:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6eafdcde296c2f58792ad39bdcd3f7f SHA-1: 4cf21cf9200e77ba4c160211d35eb8c9998f5880 SHA-256: e7828194a11e70b3dcbefb4782fff9bbb95c2e495e8ba8286e1f47defcaca0fd
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://zjnep.com/ckeditor/ckfinder/userfiles/files/54451869348.pdf In PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/gidejigigewobimez.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/gilonagimodowevixase.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130091851020---96821921801.pdfIn PDF document text
    • http://www.heksan.com.pl/file/safaxepadonazesedita.pdfIn PDF document text
    • http://hingliltd.com/userfiles/vexikitijusojanigiw.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/rexuputemarokabejezevo.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210903_040843.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/dd6f1b4ff7ebe616f189d2fe616b630c/rapaliwasunatakekinoga.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/19859143139.pdfIn PDF document text
    • https://bem-sa.com/img/file/33380942138.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/58842139468.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/fexugugiwiwerufavebotiso.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/86983313924.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5eea1832d---tipogexepokaw.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/gopibozasuzofuzolojosuli.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/solafizefojux.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/38925102904.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/venivomino.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/15250501983.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/71551439019.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/78894747451.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210910001433.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/7833311244.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/62657439681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=recover+deleted+apps+on+androidPDF 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_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 18820 bytes
SHA-256: 2132eb1d50edff4846251c661153a979d59ec447c961308d7736f109764c1b06
font_01_sfnt_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 10620 bytes
SHA-256: 630239dc2e78a23fc232e36d6257fd6ef93ecdd3a422d78ded7e544c0e6453b2

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