Malicious PDF — malware analysis report

Static analysis result for SHA-256 1831cff5715ab67a…

MALICIOUS

PDF

94.6 KB Created: 2021-10-20 23:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dd4a17656d3b308c080ada7acbf79235 SHA-1: b6089ad2876e0cdeab64010e55a56c2078800db0 SHA-256: 1831cff5715ab67ad0415211a5438fc450ffe7745a60be55f9a9d2813fa4ab26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4d5164ea2ab0b8a75fd3e084297b4e25/bisewoluwojofid.pdf In PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ccb53c824f61089500ca49ddf58d3ce4/4932349288.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/71865770133.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/puzogademonimosediseze.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613c392b25a16.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/pugomu.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/98397596445.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20211016_184355.pdfIn PDF document text
    • http://juncheng.tw/upload/files/39820852280.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/81970214085.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/kagijixupujisi.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/334828620.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/sijagezivadodemok.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/vanejix.pdfIn PDF document text
    • https://businesslife.com/content/file/85713112467.pdfIn PDF document text
    • https://shidoremicrosys.com/media/jitarisumetinakuloribewer.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/80249623259.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/50425417456.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/ranigopapesevotoketowil.pdfIn PDF document text
    • http://orlickachata.cz/files/files/56699628535.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/63444831088.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7g6qodp764j5h2u4dgadt061d5/77437790289.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152398a7716e---dakim.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb4257b84d---80021384079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=no+dogs+left+behind+adoptable+dogsPDF 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_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12746 10792 bytes
SHA-256: 9197b82022d3f86db1fe50ee4adeea972589503405af604e11994addebc95307
font_02_sfnt_off00013f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F98 17364 bytes
SHA-256: d0be1720e296fdbed460091daeac57e40b301c8e2dcbb1a0e33b2d322562dc3c

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