Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3373cf816d336ec…

MALICIOUS

PDF

79.8 KB Created: 2021-09-14 06:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c548d8382325411428552dc1405b7708 SHA-1: 1766dd8584e3f8dcc87e25439a75c4ed00d34337 SHA-256: b3373cf816d336ec8c422469ec4b18e6321bb317e3bea65eeb1a68980111258a
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. The heuristic 'SE_QR_LURE' suggests the document may instruct users to scan a QR code, further indicating a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/xobaxaxiziwubutilujixe.pdf In PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/fimunep.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090521512499.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/papajufifo.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/filiwodama.pdfIn PDF document text
    • http://evola.it/userfiles/files/38676209388.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/25965043723.pdfIn PDF document text
    • http://arucax.am/user_images/file/bovesag.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/88680433230.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/6265978673.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/95795664014.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/wanotafajoge.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/85734712271.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/43946675685.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/dubiwawubar.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161382f712156e---lukijajofaridulat.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/viperigonuzegujagawopepum.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/nufagusosamitupakefeni.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c910206b74---18377348859.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ba924224---17067369606.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/82271881450.pdfIn PDF document text
    • http://preiss.at/upload_files/files/pibawuxakofikufij.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/bukusuxoduj.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/16815632137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+random+video+chat+freePDF 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_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 16300 bytes
SHA-256: 41837e6632b754ff8e2bfe3669e8c1a3c23446b205a952e6f4336fb9905fc5aa
font_02_sfnt_off000118e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 10812 bytes
SHA-256: 99dacc4912946b42e9106c1b11f44b72844bd974c0d83f618145e6c31ebd4f18

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