Malicious PDF — malware analysis report

Static analysis result for SHA-256 14feea2d3ef873a0…

MALICIOUS

PDF

95.1 KB Created: 2021-10-16 12:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1239d18b639e9105f284772503d3f043 SHA-1: 661637e4415bf822a10feacc4d24c5e4fdd00d85 SHA-256: 14feea2d3ef873a02e72d7a95e8528f9257f16823ab14635867ee589e389f3cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://sergeisurzhin.ru/ckfinder/userfiles/files/gumumano.pdf In PDF document text
    • https://dla-pracownika.pl/pliki_user/File/5844751623.pdfIn PDF document text
    • http://skncn.com/u/files/tofebamuzumat.pdfIn PDF document text
    • http://sql110.com/pic/39250404050.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/miwotari.pdfIn PDF document text
    • https://dellrein.ru/content/file/79605131029.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/2478566548.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/8824984228.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/ximukazazuke.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/bogoduladevukebegeva.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/vexoliwotokaba.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/pisufedugufeb.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/90814405335.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3784d5216---niwetiwazomifukozegi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/982tu6i7cevt056ii0d7me3i77/65967098421.pdfIn PDF document text
    • https://aedwea.com/upload/foto/muwagazubitiguvetine.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210906195432.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/mexikekitomerukatujudewo.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/51405205918.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/55440878387.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/jenorefetedefes.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/59844100593.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613036ffa4a7d---risunezabuduwenos.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=pineal+gland+lightPDF 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_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 19712 bytes
SHA-256: 8098f45be57459e4655ad5febc060b40c6053bb46199fd09ecf1a1e0a00bc07a
font_02_sfnt_off000158dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DC 10140 bytes
SHA-256: e311c44ca739e50e3a4babf171798c34b3c21802422418158afdf8b78a38badf