Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cbcfe9028b0228…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 06:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 528a9a06994123c1fc856e096d430adc SHA-1: 9247732214057b3427cb6364fc836e56f3b22a00 SHA-256: 28cbcfe9028b0228ac5755fccc51bae33eae271cfcf8b107d9f573ccef6b9f95
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several embedded URLs point to external sites, including one hosted on a compromised WordPress upload directory, suggesting a phishing or malicious redirection attempt. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7258

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://gsemilia.it/userfiles/files/debasokezujew.pdf In PDF document text
    • https://yellowstonewildlife.com/fanavudekakamimowu.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/2591435611dc2f3ee752.pdfIn PDF document text
    • https://izr.fr/files/86742833869.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/wupikamudo.pdfIn PDF document text
    • http://teraval.cz/res/file/60516125928.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/64165085001.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/34928701540.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/latepexinog.pdfIn PDF document text
    • https://denimder.org/resimler/files/92118845031.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/duzevatuxutup.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccc0d52454---43145393075.pdfIn PDF document text
    • https://tsegypt.com/file/raxedeloxodaba.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/xiwikaposewesi.pdfIn PDF document text
    • https://yellowstonewildlife.com/32631755719.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80783d092e---pinabowabewo.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/sabudalek.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/fuwufapozoxisujeb.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/kijevolipar.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/8e19d7a30b79cab513bfe8e5b9607f4b/31961047708.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccc160e9a---tutenobivadora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=nightcore+would+anyone+carePDF link annotation
    • 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_off0000b6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F6 10760 bytes
SHA-256: ccab42b20e47c5814056a8f6f3f2dc8bff3c5db1d40a7a3f22ebaf1d36731d05
font_01_sfnt_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 17116 bytes
SHA-256: 74642539b76373803556bb1681750516e19b3a7b3624be609fb92258c98e82c3
font_02_sfnt_off0000fc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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