Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52bcbfe466ffbaf…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 20:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 457391e97c4225623338e72e5856e722 SHA-1: 40de9f74b4dfaf6740dde6d0f8a5edc271e50b03 SHA-256: e52bcbfe466ffbaf707bd4ff16fb1b7d5c999b27d870f1150b42f2ab671df9d2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of multiple external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160807593683ad---marunelobilasuvegijigi.pdf In PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/xukixobanuwumu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608046897e3ff---jaluwi.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210719_A8B1A9AE959B2C5D.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4a0d5573f---marafedenetupugakuvu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a5005a4cd---pifelali.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/35951986463.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/wasewoduj.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/53679077163.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/vufirilegilamilado.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/bosafetu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d739d97ab---10867870492.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbdab886be---mololisesa.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb04ceffaa---64690152051.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/losisulufedivaxixugopa.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/sudejuvuka.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/10526772369.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/zunafokujexutosov.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/033420e41ec69e7edf7fd2553c46b8bd/82528382189.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/97343362261.pdfIn PDF document text
    • http://sinostandards.net/upload/files/wubitizuwuzadekozim.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0f1a50351---33970634550.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/14927093219.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766ff452f0d---digije.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///59055392704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=american+revolutionary+war+worksheets+5th+gradePDF 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_off0000c734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 11388 bytes
SHA-256: ace086665f7d407833b8a137013dceb81b50da2471f14a23accc810290f2c383
font_02_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 16640 bytes
SHA-256: 9212107d2e1809fb277643746fc514325729c744d1eaed644672e4a2f2e7b8dc

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