Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40a39974b37041b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 09:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 485d8b414b597db9998d351550a4a7d4 SHA-1: 4278e077ac2df399e99911833326289b892c8c4d SHA-256: f40a39974b37041bf05c3c4a63e26a8eea1e1e60180096f72332be6b5431d086
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The presence of multiple unknown URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9ae5cf9186ec9e9c0e1d86bd8f2a1063/50872362407.pdf In PDF document text
    • https://helicopterleasingservices.com/userfiles/files/54673156524.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/nubugetisonugarokim.pdfIn PDF document text
    • https://eventaipei.com/upload/files/50908857290.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/juzipijupigazagikewuge.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/12506718365.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/501946a404b80dce481f6be23bec697d/rofafejenelosodazuweped.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/benukarujagapisefimebegit.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/6820661866.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a3718469---35624586967.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/89595080564.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/sukisilufimo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/25246997111.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/15444004314.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347e57021f0---zenetivimanalumujivesitu.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/82132914458.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/resazadiwe.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/80972635420.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/48176026362.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481d6510fc3---simavotokexidixow.pdfIn PDF document text
    • https://pcetravel.com/files/file/8144243209.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/93522863284.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/98452915383.pdfIn PDF document text
    • https://mimpidia.com/contents/files/60465193056.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/jelalapixokefuvedikaxunes.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/fulitiwovefanulujix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ubuntu+fix+windows+bootPDF 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_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 10344 bytes
SHA-256: 1e7edc937049e177d2138a5fa46c9e0dd3ae2258a03c85f3c113e0252878daf1
font_02_sfnt_off000116de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DE 16664 bytes
SHA-256: c40b7e28861224571bf1ca05e4c6b4c1e77084381232b7e463311044d25ada51

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