Malicious PDF — malware analysis report

Static analysis result for SHA-256 df11afb37385c4d1…

MALICIOUS

PDF

88.9 KB Created: 2021-09-11 11:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c501684e5e808f9d63e11f562db9eb27 SHA-1: 5460afcacfa8837266d7d6cf70a2f56dc5af9993 SHA-256: df11afb37385c4d17d9215f3d3469bd65c71f4adbd4cac13de471fb736204b9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple URLs, many of which are hosted on potentially compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm findings suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://avvocato-callegaro.it/public/file/neripavukenodiw.pdf In PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19850252932.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613462cd7bac2---99350609045.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613417ce65a39---35876100154.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/23410178419.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/zetizorinulisaj.pdfIn PDF document text
    • https://udruga-invalida.hr/files/27900930030.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/98106419920.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139c8d977448---gudilajanevafinajirora.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/36058595940.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/61614996211.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/nijetijedivirezo.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/bisoramezego.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/84827263884.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/tefenopumafu.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/zexesezerigu.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/jasorujujoregex.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/gujanipobuwipaw.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/83247229091.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce5cefdcd---42893782350.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/damadizubewerubonabulip.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/59011366086.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/75713183782.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/acb0846e76aa0c5f4520596f400e561d/dedilukifaxujunalarazawus.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161378d9136ef3---96596601171.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/zixiwarisiw.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/kibole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pixel+gun+3d+mod+menu+downloadPDF 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_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10688 bytes
SHA-256: 3b4c754d7acd045eaf2b80629798c85c4c09ad42602ed0d263e978bad0aaa824
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 21276 bytes
SHA-256: c5ccd5f5fb7a36b9ee1788506d8acbadf5996f8b60be8331ddec69eb6c950ba0

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