Malicious PDF — malware analysis report

Static analysis result for SHA-256 1504a9caa611b083…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 12:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98be5ce36ab1feae147a0f9be42f5b39 SHA-1: 1ba757a3e7eaacc0e250194461115e21f4d49d8c SHA-256: 1504a9caa611b0831aea05c7033c2dd740874694f062e510bc291bf960930f38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to link farms on disposable hosting. These links likely serve as a lure to download further malicious content, such as the PDF itself which was flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 http://ipcmanpower.com/admin/style/images/userfiles/file/valozaxo.pdf In PDF document text
    • http://hcwan.com/userfiles/file/supapon.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xorajewovaxe.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613653e776e97---gitomokuwepup.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/97074131043.pdfIn PDF document text
    • http://dobermanncz.eu/files/vixizesikejije.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/44874557869.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e7299136d36449ec6a86f7a628c5c3b0/galekubadinuvi.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/46146804128.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/61003042704.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/lozapusodenijewixolapef.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/dedilumisevazoz.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/sesofojowo.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/99376041141.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/85145477203.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613df3a9b3b97---bemugisirurifama.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/99446395186.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/54060456356.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/13388763218.pdfIn PDF document text
    • https://titishop.co/upload/files/zolaxaligagasizavipewuvas.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/wisuxodenodusi.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/fapovutawiwegalazivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+does+software+update+mean+on+androidPDF 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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 17940 bytes
SHA-256: 0b165603843b7c20b7bdc446c5e4f873d6dc096428bcb1380cc4fea323d84a7b
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 10896 bytes
SHA-256: 55e18ef3a98de81f7716f74d2702130ea4d54644828f168ad4c3cdf173b12acb

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