Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56bab3ac0b4cddb…

MALICIOUS

PDF

122.9 KB Created: 2021-09-05 15:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b25279fd7cf4e92839f96fdd692b849 SHA-1: c500104e7a07fb1ddee4d3997763690e051d8c3c SHA-256: e56bab3ac0b4cddb36eab830f88c7aff763d771e73c3a5948444e4ebdf545a93
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links on compromised WordPress sites, which is a common technique for distributing phishing lures or malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba071bcb54e---rojexidawi.pdf In PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/53201210927.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/45554682986.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e41895a690766f869cb14a7ca25cde05/lizitatejakikewe.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/60122672860.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4c8db289---fekezapafobubesosu.pdfIn PDF document text
    • http://yoron.net/up/files/55315843611.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210611_051740.pdfIn PDF document text
    • http://unseretochter.com/images/file/pawakorop.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/84370750249.pdfIn PDF document text
    • http://mcutech.net/upload/2021/08/file/1630259384977353798.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/nukisuzuges.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/23po66l5btpgf3v56rlgti6s34/rozanasuzasamogufumabav.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/738573107.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/31243673120.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/damopu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/9j07ip1kicju0uvgh10qbojvbv/82928736949.pdfIn PDF document text
    • http://inica.org/files/file///4669023942.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/18734286906.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742de2370ba---6459542867.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/robudajinewidexasufilez.pdfIn PDF document text
    • http://szwygs.com/upload/75050643248.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2a317841955a22f83fa774292b0a36fc/98574974947.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/aac763cf73baa57d7b406b8581f332fa/98789295155.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ecd4a6f01---duvixatabezolusuzikifif.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612575aa36409---muwelenazifimatago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=beijing+metro+map+pdf+2018PDF 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_off0001775f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1775F 19752 bytes
SHA-256: 11f5a70a74208771aabfe69d84b0b78cba8af52baab8269b05d089ac973d07fd
font_01_sfnt_off0001ab4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C361 11312 bytes
SHA-256: c43ee1d3726ca00afc8720ea87fdc281f16461f154501aaf49bd76fa7a068cde