Malicious PDF — malware analysis report

Static analysis result for SHA-256 373500065345f9bf…

MALICIOUS

PDF

71.5 KB Created: 2021-09-08 12:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17ad2b35b43cf959e927e4d8b473ca4a SHA-1: 1e376bbf7fa2904203167493bfb7a811f933b082 SHA-256: 373500065345f9bf21212f391ca70d7fa228c1bd5b975dd87230c3a8e5ea461e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5242

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099a7075f69b---guwefirovaxafudaz.pdf In PDF document text
    • https://faktxeber.ru/resimler/files/mufutasabeja.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/llcfq3uvfrtgckk9ojinijkepv/xamigutivox.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/n1kj02kp1g1dooug1lhvrpcp3n/davumisuteverivomof.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079225b5097f---89225470138.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/vazuxajudeni.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/gjlkg8iapo37t5qud80r5vvgbp/mejozite.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f09a0424---52287163491.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/rimisefagenitevapod.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/66807835294.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/xidamowugojosipura.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/najewurizupi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f7181f898---78380043952.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a58e44ae0f6---82617789785.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d551bbef3b76be0ec8677f6ae14a5338/fexupuxu.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/ab1ef96052a77aa5d042e29e6aead481/fidolexaxelexowafene.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/767376939.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a16fbdb188db498852592ef35c0cfa38/16305869266.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/67241218707.pdfIn PDF document text
    • http://santeh.md/img/files/vupokevivedow.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723943ebb7a---2621420221.pdfIn PDF document text
    • http://skomi.ru/img/files/file/61939212131.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/xigifulesamiwiba.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/12104306627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=2018+chevy+tahoe+lt+owners+manualPDF link annotation
    • 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_off0000bcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBA 16132 bytes
SHA-256: ce6d7f20a084db461066df682d17d107689870780cad2c482ceef57736667d1a
font_01_sfnt_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 11172 bytes
SHA-256: 5dcdea0ca569096edb83da578145991c48f6a860e07dca14a9c90d8ac23819ae

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