Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a817141e393b1b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 02:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eaf22aa89d256ddfc71c7ba09277afc4 SHA-1: 3faeb8de1304222a13a667c56bf6a8e2b7152c70 SHA-256: 63a817141e393b1b397b22ac49a6385935e38e5399e70008aa3178938c8333af
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 high likelihood of malicious intent. It contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious content. The structure suggests a link farm designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b996d139c9---17035823942.pdf In PDF document text
    • https://mahae.hu/files/files/jezanukekizazej.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d02a704b1---rimugora.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/rezan.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/45019827546.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/55744700135.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e461fdd1df7---45462214267.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/lediramuxevenipovebutege.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d7ddb60d---minezufaxejojugage.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766f9c8124a---50903266473.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vqjmilreo7qk5o58lo1e053842/megunusimasuxuxiwabeg.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777b0c809f2---25161237780.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/cdfe740b5fc29435b0f02bc75703c2fe/vijirusa.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/98079817368.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/93404408019.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/3740726139.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7ead1e03---53438367171.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/31743659345.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/kutikavixasaxumujijixovol.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/sapifesomoxinedogazukuluj.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28faf10e4---3886256306.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f045f744dc9---biruxonujiguvajajemur.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/98181055442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+marriage+of+figaro+composerPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/88812981447.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_off0000d009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD009 17844 bytes
SHA-256: 73fe4479902d9a2293616caf1dc142ef1e9fc0cd48ded4f79f83444cfa27914b
font_01_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 10640 bytes
SHA-256: 20d1bf8d7845c6d0a9d52a20483d7fede2690a4323a96b6265c9da6a36ecdcba

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