Malicious PDF — malware analysis report

Static analysis result for SHA-256 97af668b6b6f9565…

MALICIOUS

PDF

89.5 KB Created: 2021-07-22 22:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3afa6a65012b80ba7f1dd1a364dc6c4c SHA-1: fc3543e78156a634ef2558d0507e5ee2c9ffd219 SHA-256: 97af668b6b6f956563992753f8fde83c506dd05cd71bd57dc83df6cdfc2bd563
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, many of which appear to be compromised CMS uploads. The intent is likely to lure users into downloading further malicious content or to engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://entryexpress.online/chapter_images/files/97744822758.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/qo0esnienigm1hb25u1hmmvnun/86531986912.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b78cc01c1e5---44889853745.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5df22a9840---fepewizedibejizab.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/kamalab.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/pimozezojibufabi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e85ef0ebc1---wuwuguzaludorivuzebenox.pdfIn PDF document text
    • http://dejede.com/userfiles/file/vebawozenezomir.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/lozadot.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/33835870320.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/34652932590.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aedad6c6d---robosapebodoxi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096e5e5cf35d---59304205015.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/8108017146.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/gotavemudogu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80925e3f8f---kotezefuj.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7b73d05be---ninunal.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/fudagokuzepobanozovo.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tctin1r96lks44hn625s6rjr84/28862255491.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/moletimobirabi.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/65646373244.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/xaboxewox.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2bb0f2c60a6c81337b06f7fe5f189fec/14407871648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=all+trapezoids+are+rhombusesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 10836 bytes
SHA-256: 7b11186613fb87b4cc7e7ec72499978ade46eda40945ea6f971e9c324db18735
font_01_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 16220 bytes
SHA-256: 6489e646d18458765199a57be55f1b03d5d70d63443aaaa6399edf5f717c03ae
font_03_sfnt_off000128de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DE 17944 bytes
SHA-256: 63ca87237df5827e2baaa03b516e12078b827c70b572a7197f8d6b8df8cac7f8

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