Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f0f3df85785e97…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 03:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b80d2612d273ecee364cd68efa78d061 SHA-1: 41ae73fd699bd6df3128257c02034d31273fcaa9 SHA-256: 41f0f3df85785e978c7b916f8eee9f429bf2e4d73476475a82e63683054048f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The presence of a link farm pointing to multiple domains, including one identified as a compromised WordPress upload, further indicates a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier also strongly suggest maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9771

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://guptajimarriagebureau.com/userfiles/file/kafejokezigobenus.pdf In PDF document text
    • https://gifarlcm.com/upfiles/editor/files/72378788203.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/74001243517.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/37693795553.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16146573eef94e---41898203646.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/35078577518.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/wegudovab.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/12455516222.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/266815805.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/mutova.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/22656724041.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/fozaridonajepoti.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/madisasarotipuxerusonal.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/52071117097.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/dca858702176abb95513fecb387f741f/rekaferefiru.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/91458324902.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/372f8e69288ad87cb0e79c1960f8c97f/9164237325.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/welamabo.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/58787055811.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/25333908065.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210905_191917.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/giluxemejisu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139434b60345---badadetemirupadutaxemakun.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/disafagukowipo.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/xaxagolenofo.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/29293754067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=appcloner+premium+mod+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84C 10584 bytes
SHA-256: 3a428d2d94ffb00b45a02e6d851cadb037ef0b4b8c73d520e1a3d3f4f04c2126
font_01_sfnt_off0000d05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05E 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_02_sfnt_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 18932 bytes
SHA-256: 8c49528a8a3744c28da4375972f2295803301dcf5795f10ec47dde55ce182142
font_03_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00012c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8A 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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