Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8ec8241b842b52…

MALICIOUS

PDF

102.1 KB Created: 2021-06-23 01:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ab9db35d0b15a9341dd3473e73155f7b SHA-1: eb8ba95228ccb4b93e62009549033cf81153d7d9 SHA-256: 9c8ec8241b842b52ad57fae340b8f868b37f708e76d836d20ef67d1fad86a709
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to numerous PDF files hosted on compromised websites, likely intended to distribute further malware or engage in SEO poisoning. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7294

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.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/jtt4nrbl48edujfslj1kcf6oaa/gefevexozuzaperez.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/c574ljnk7jm8ocld5vb2pp5ofh/faxujine.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0afb2d84---jawuxomapukig.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c7317766---litokise.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c38adc119a8---fuwokezopozuri.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/bosegur.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7735e7831---zodiregesuduv.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a138062f6de---93980571797.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d993e97d---mejujunolutes.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/55034435416.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/zirapowodero.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b670667ed164f1d1f9916344a2f40f4b/wenipu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836314ba036---10150981910.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/7ffcf330dbc886c53f80f3f16729a6bc/wusomupelugigowo.pdfIn PDF document text
    • http://446888.top/userfiles/file/fawalulujapazid.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dgu5u021qfsp2fhomaa1cmojt6/jirozuvumosatoxosesuvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=yaaradi+nee+mohini+serial+actress+swethaPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 5232 bytes
SHA-256: 22fefcb374331657eb5a6d249c12b9b76ccd905414b799e246174e25fcc71b0c
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 14180 bytes
SHA-256: d24e1fbe47355f38e9ee8568e40c6e9204e0a5c7191fa17db5396ca9d112491c
font_02_sfnt_off000124ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 3680 bytes
SHA-256: d4746352d7a0cb918b8a185ccc219d4b0f5c10429456198dd4ddcd45ec2fe934
font_03_sfnt_off000132be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BE 3216 bytes
SHA-256: c8ddc68b8b0de1ba109442b4cf8a6e1541ccefde84a818294d13cf08b677dc13
font_04_sfnt_off00013f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8E 3916 bytes
SHA-256: 840605d5d32541dd034ae1f504f8f99e6484add96b26540cabec1ec8f80f8a00
font_05_sfnt_off00014e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E02 11256 bytes
SHA-256: a0b117599e4626dd46cdbdb1dd1b24adc0b6a6493ce6a4557854bc3c1247b1ec
font_06_sfnt_off00017460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17460 3532 bytes
SHA-256: 47cb0f5e2078b9ca6518bb4d97da426867d4f89ab7649e653cea3fc634b2fd9c
font_07_sfnt_off0001821e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1821E 3812 bytes
SHA-256: 8b19ce13436437212a83ed250d2b8d9f7ccad17850f61507c8fae91b5d18f656

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