Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd20861f46af98d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 04:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da0062da1d28f051a325b7c2a59c311c SHA-1: 09b82d1900fde21ede3c3206277d55967e02aead SHA-256: 8bd20861f46af98d7f908e5ee2761799a0d9fe3c76dacee1c503fbea94536fed
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised CMS uploads and disposable domains. The presence of these links suggests an attempt to redirect users to potentially harmful content or phishing sites.

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 http://local-minicab.com/survey/userfiles/files/57025327140.pdf In PDF document text
    • https://chv.vn/userfiles/file/mesizowiwi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613771425388b---jejaxozifepi.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/37463577835.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/vogidovazi.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/dizafora.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/sasawunijo.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/44448509571.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109040046418918.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb1b46b06---luzaxojubawid.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/99702334780.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ed0b4438---39265967155.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/3541313282.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/18538236303.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/82870726649.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/21389620876.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210915180339_672804890.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///2769677740.pdfIn PDF document text
    • http://chayka-svg.ru/files/66405122206.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/20361829461.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/vatamiwif.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1a55adad---1154130798.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/kivulafijusikalabu.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/biriputakodigukemelexo.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/kijanalenisutuwazale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ten+most+populous+countries+in+the+worldPDF 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_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 10768 bytes
SHA-256: 8265ffb0932decf2f3cbbaa63cb26953d0e7dfa1cd8d7babf0a61f8637bfad9a
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 17496 bytes
SHA-256: d4d2ca8df495da7a093d6b3f5d857c67fa954d997664147f87180a6923a57699
font_02_sfnt_off00012bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1