Malicious PDF — malware analysis report

Static analysis result for SHA-256 a188cca69e37f15a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 15:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ddc202b49c8a73d1badbd158a068f68 SHA-1: ed74e0e8c690082e11602287548232f38e941689 SHA-256: a188cca69e37f15aa4947570b565e5e2cc5ab36db0360577a7ab9b9432d3fc6c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified it as a link farm, with many external URIs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=horn+fight+live+stream+free PDF link annotation
    • http://seto.cz/uploads/gutogixevotopojovozapu.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/xerepepufaribinategifele.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210904_F48FD5BAD19697EF.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/wanosoxonireduzesuwunap.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/59640627059.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/40220880196.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210902015557.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d7fd0b592---kogiko.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/81754158370.pdfIn PDF document text
    • http://pololanna.com/user_img/files/65533492428.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/54485491425.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613908de6b2e8---40699701451.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/90106311005.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/24106238133.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/46121972042.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/vudakazuvupup.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/taxosibaz.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/miwope.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/59860466324.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef12f3b47---27536201730.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/30270737062.pdfIn PDF document text
    • https://toocapen.com/files/wadobukafema.pdfIn PDF document text
    • https://people11people.com/uploads/File/barokuvodelitagorazinuji.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210905001944.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_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 17476 bytes
SHA-256: feb4353443536b0776d9655ce5dbc84a0f10b2877853ef5d27edd5fd3b051022
font_02_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 10716 bytes
SHA-256: 85f648e3e35999d8251aa7d88eff09fd39dd688d9481346b31811fb2031fabaf

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