Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e715a52c8291fac…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 08:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b53b35477788334210f8cc73d27f52f SHA-1: 0729bee685ae70d24f2cee317655a2f5933139a3 SHA-256: 3e715a52c8291fac2f0552f0bae81108a515eaf1097a964504552f00b16f2a09
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a deceptive user interaction. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely intended to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=monster+legends+hack+mod+apk+download PDF link annotation
    • https://kurek-rowery.pl/user_pict/file/8848391317.pdfIn PDF document text
    • https://pcetravel.com/files/file/8144243209.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/99505308833.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/47467885732.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/wokijolakiminowore.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/20903517167.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/38920888115.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210909_2699ADC90E27C263.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/suketopakajikori.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/mowokupik.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3586c2b6cfa4c78e485eb6b88a9b51bd/zudalufefev.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/35902733404.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/kavafirezakomakuturujow.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/viborejumekufumabuz.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219111126432499.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/lajusefa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8aac85b41---liruxerefofoz.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/82067818431.pdfIn PDF document text
    • http://hingliltd.com/userfiles/jemosokazozigiferive.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/fenodojuwulugoniwital.pdfIn PDF document text
    • http://boki.hu/editor_up/mobokokivupituleti.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2e1c8995---powiwitipanuxigujuludubiz.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/kijafadeditujapoles.pdfIn PDF document text
    • 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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 11040 bytes
SHA-256: 44555a190628420b20f358fc2d3b0c00751c6b427f2c4326085e18bc08257e87
font_02_sfnt_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 18896 bytes
SHA-256: e40d17f672516c15d9d9d22eb4a7591fc001f3f0c64708314219001c8a237a24

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