Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe7c105b1e29a46…

MALICIOUS

PDF

71.8 KB Created: 2021-09-08 06:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d62ca2583241151b4ca8bac782254dc7 SHA-1: 539f4a5f5cb975cd1398756d3f201a37daa8523d SHA-256: cbe7c105b1e29a46e8b50497c7c92e627e5eb9bec9afdf11784fd56f83b5e2e1
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8720acdd8853c960dd950170d92096f1/96151650215.pdf In PDF document text
    • http://riversedgefm.com/files/file/xakilagawixoxibof.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/62160242626.pdfIn PDF document text
    • https://kaimano.it/file/jaxagelurusilirova.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/tubigibezikufuva.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/sozibekasatunivekolisiwa.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/32872536974.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/xiravisej.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/20283342710.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/38578222666.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f303bd72b74d78995763d2872c948996/61574001372.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/62349679014.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/91860091234.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/pixomutijubixiteji.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/57408058724.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/xuxelugivinotomefi.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/jasofo.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hrt758a4ua3sql76mlvcv2k7nq/guduxoxasudiwufutawaso.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/jobifinupazuwefam.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ba351f7b64f0a439d6dd960c45f1357f/86837764124.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608842210d1b9---13021538565.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607857d42db41---14551537091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hermeneutic+phenomenology+pdfPDF 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_off0000b8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FD 15720 bytes
SHA-256: bbaf88132feaaa739cd4acb670cb62b03c6accd643a7979cc711008c6690bcdd
font_01_sfnt_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 10940 bytes
SHA-256: 3e3e0f477add3ec56ff2e319689c32ba3ce48c46806368ad3aaf00816cf34d18

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