Malicious PDF — malware analysis report

Static analysis result for SHA-256 649ec21c564b3fb4…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 05:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69f577506afd185a18157887835c42fe SHA-1: 85e92decbf7f1b53a9e2c325928595064111443a SHA-256: 649ec21c564b3fb45c11a5118c6a55a130f320041863e63e66950bc757e88915
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The file contains a link farm that redirects to various URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting an effort to obscure the final malicious destination. The ML classifier output of 0.997 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/933acc148a0e48caedf82633fd40560a/bokivexevad.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6i3gukcbo55m5ntlorjfvngj25/dadukowitokonagujitejewek.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/16415577860.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/os3i0rio0cht8c53caadhegb51/zevigesenakurufisamor.pdfIn PDF document text
    • http://standdominica.org/files/files/49926469853.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/nogoxisekutowupaf.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/5301135753.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/33569443182.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/87661780069.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161050af1c2f16---44100720808.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/59933218248.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/397770d9c35611c2a0ad2d05f684f523/nevugagaxat.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/letavorobasulebuzaz.pdfIn PDF document text
    • http://poultech.net/d/files/muxofenekiribilavegedobi.pdfIn PDF document text
    • http://xycrusher.com/d/files/1779068821.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/danobegofes.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/ruxilejibasebojo.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/64596383363.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/85250855789.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/86872919597.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rmn96vrghss73sgje9bo146p59/84762323891.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/911632c3cdd8f6db7a30f11e0e3f3937/tomulikuwiwifejidobomeb.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/metaredikowapasebip.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608683883669a---vigekiditimoguru.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fcf64b4e8---20210221278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=travel+vocabulary+esl+pdfPDF 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_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 17336 bytes
SHA-256: 932beb12eafa15c721594c1c145eb0b9c51b048d3414b3637f8eb7c76ef9d88c
font_02_sfnt_off000132c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C0 10700 bytes
SHA-256: 81dafcdc31518d99885568a1ed1b65b766ef210b047639c2c69de3199567a076

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