Malicious PDF — malware analysis report

Static analysis result for SHA-256 9931ed5b80d5735e…

MALICIOUS

PDF

77.4 KB Created: 2021-07-18 15:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d128b2a6f02ae5f0af62cb204d2a946c SHA-1: 64b0a468773effc3104fea2e48b02a470cca3374 SHA-256: 9931ed5b80d5735e7090003557333cfff70e085a04279045ac440152573994de
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous external URIs and a link farm structure strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nhs1980alumni.com/clients/878257/File/97079586898.pdf In PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5d8b818d2---25727000804.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/66403832342.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/julabotinekenorajusu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078a633b193b---42556706164.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/tupofipadesovug.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9i6cg559j6fvub5t530f5tvv0/weworameva.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/21960722067.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/nakefisikaxuw.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/41046215588.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a15212c3a---tarita.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01354c2631---93171274669.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/lezipudotiboporodavesosil.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/puban.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/5948642873.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050304045561.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada610a77e0---zagemulatobiridoz.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/mitesegifatewozivigaruvop.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/89242307321.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2ad0a3cf4949dcb5a8f3718a69b9991e/jijajukekuguxakapodi.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/jegoduxakalepedobu.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/sizivumabu.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B8E3733AD9B.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9kd36o57dj0dpk4jldsm77vge2/repapodabibuzasuruxomot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=holy+holy+holy+lord+god+almighty+lyrics+and+chordsPDF 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_off0000c88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88B 10788 bytes
SHA-256: c802cfb9f13831b316833e5e92e341cb913a47a50a974e6ac75d18aeee590eee
font_01_sfnt_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 17004 bytes
SHA-256: c4813ebdd85afdcd1787e281a9c16c2a5cae66ccccf0407b7545296eba0f0851