Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb40475a9ea8d9b…

MALICIOUS

PDF

99.5 KB Created: 2021-07-04 13:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 080a80ccd84cb9650200bd782662dc4a SHA-1: dace15fb5eef5eaf530b552d50a087b495087dc0 SHA-256: 5fb40475a9ea8d9b613fd28ec7cf727013f669b5b6ef4bfee2e629b0efc596cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to potentially compromised CMS upload storage, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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 https://nomylo.ru/uplcv?utm_term=short+words+with+h PDF link annotation
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c0ab003fa641185ad63ba7a66d22e6eb/vufogadudufesomurafabob.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69976bc771---xinabulanerebuvez.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/67694729739.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/985119509785a17a13e02898373b7d44/97064191845.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0001d82407---rizuwovuletitixujo.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/zedifodafibogo.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/09/file/20210509_034555_131.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/vevozubosozibedufuzibutab.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7d9d3515475dde2558e643bb80d572c9/67250023151.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/07fd644e68a89dfe2fc2a2c212fffcf1/gukojodavomajabites.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/puxifademinorax.pdfIn PDF document text
    • http://promador.pl/userfiles/file/87896735496.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/985ab1e3e552e4fa584f6c5a3071104c/48762947688.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/191ab332c0111aaf9de6922d96074322/83877844710.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc12d4033---jonolafaro.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b230c5428f---50248251117.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0664a5a138---lixudimukefuwosesimu.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/68729bccdecacd192d488ffa8e0df949/51789449176.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b36db5649c6ac2d5f6251cdb037c88bc/32080674146.pdfIn PDF document text
    • https://cristalensi.com/public/File/josuxamebo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb1b71395---67061382854.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/23424444902.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a09ae45a---32384018394.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/xexademeruvomiranumujom.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/girovitoneneluzumiveruzi.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/73136838127.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 10060 bytes
SHA-256: 717c29bd7b7eb9185595f48ebdc818dcd69128e1fb2c10f25b4066c73f46186f
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 28268 bytes
SHA-256: 55d6c2889a34c3b6fae6fed30f3877c343950a266a35951530a4ef5461a3bf12
font_03_sfnt_off00016a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A51 16272 bytes
SHA-256: d9fd2578dddad7a6650f7a98bebf4646df8ab651c4007856c32a52f59ef100ef

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