Malicious PDF — malware analysis report

Static analysis result for SHA-256 736714b3e8a861f6…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 13:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdf6b8a44090534e18a944715fe27333 SHA-1: 79cd30bf36e8f09a7495d97b2ca7bea6486650bf SHA-256: 736714b3e8a861f6616d2dae897d967ca4c3cc470db2c83301e54f05e25f2790
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614412cd9090a---12279165839.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146220d7d371---94431303317.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/63854923049.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b95a36991---jofazivasos.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/xuwosufepejibavap.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/71007699966.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/nemofa.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0533c762---52158890693.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/kikedokogadikokuzil.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/vesemapozipafotalefo.pdfIn PDF document text
    • https://seerupit.dk/assens/file/bizewulejasafudeniduzi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614553c9226a2---kaxizomamoxeb.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/tebopudeno.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/tasebe.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/fegirapupaxamojijitup.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/kabisobamemiporubemilexe.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210903091702.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/wedatiwu.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/zitixiw.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xalunebowekawadikeg.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/76424951658.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/55415260040.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/rosekasawasomedu.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/tezajug.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210919160756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pc+remote+serverPDF 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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 10052 bytes
SHA-256: 23a3366381b1c18be9f13346d798221fc2bbbd273df0c0e4219b84d25b7ffcb8
font_02_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 22472 bytes
SHA-256: 941b3c5573019be06653e98b5f0bb9b5be1528c1231e6577d4da2997f5ffb8e3

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