Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa9c4370c50bc72…

MALICIOUS

PDF

75.2 KB Created: 2021-09-09 15:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43dc5070f7684051e8d309143ef573b6 SHA-1: 7df1ee9481d3f9bd9d8df2833eb9a7dbee24eee5 SHA-256: 2aa9c4370c50bc72c9a8cad4994e4aa30095feceb758ab375d6596aee249f438
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to various PDF files hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution attempt. The presence of multiple links and the use of 'utm_term=download' in one URL indicate a lure to download potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://autoachtercamper.nl/userfiles/file/73998446948.pdf In PDF document text
    • http://asia-test.informacittadino.net/media/files/paremovisu.pdfIn PDF document text
    • http://land89.com/ckupload/files/fazujikokupokexezamubokam.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/99930489233.pdfIn PDF document text
    • http://babamoleskine.com/files/file/53448021377.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea97ef72f---bexik.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/52583986379.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/nojigi.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/32462776209.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d182767aaaab0966e711770700a44b9f/66820720471.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139db2643eaf---koxejo.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/98959972750.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613690171e954---joxajugogirigurumumumuf.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecfe16725---36282208319.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/baroxaganegusunekogamo.pdfIn PDF document text
    • https://netpage.info/userfiles/file/55521071387.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/wopeguxusilivivin.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/16827681110.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/36165988452.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/40476551054.pdfIn PDF document text
    • https://nexapos.com/upload/files/fozarurowoxurijevezi.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/10015634559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+minecraft+free+apk+1.16PDF 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_off0000bddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDC 18800 bytes
SHA-256: a6188df2c6e3fde6eeea6cf0157f1d7b04b70f05dbfb7c3bdfa21f868655943b
font_01_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 11076 bytes
SHA-256: 41c56f62f017d6e23ea572236d9e2933903133f58a2ba29ab0b82e65b6b04a3e

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