Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e18d6559a7bf59…

MALICIOUS

PDF

86.8 KB Created: 2021-08-04 05:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fac7c91cce9cab1dd425df523ab13c14 SHA-1: 4e3cbd4dd181bbe84540fec37c9176386f43b15e SHA-256: 47e18d6559a7bf59d1beae81b60162cefd7b1f9d7a620a52b6dab079ebbcbbd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The primary attack pattern involves luring users to potentially malicious websites through a collection of links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://zimaletto.com/uploads/file/laxapije.pdf In PDF document text
    • http://lorichphoto.com/pictures/file/91076039866.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/nipitugofuwejijokupip.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lo6aqocl5sd8ce3qoigpq8fp41/74544650924.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eda1bd49f---90121224331.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jebedamujamifa.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/18853630322.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/38645263749.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/26644158209.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/s9emcqqea1cvtbpvt1jtfa7bvu/vovimadesuvanekuxasajarel.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/024a94213b827dea2fd79483d8be8c81/92304988351.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/mibijiwufiged.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9868efcd---17798802404.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/31sqsfj6f9a568putcncbfbms0/19848217577.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1dffea255---tuxalu.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/37540981350.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/mumijapirotureto.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070579646fa2---42953669582.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/k996aonvbg303ntr0qa2la2j73/jedegavopoziviti.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/74576793326.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/sekenetisitaj.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37f5d90f3---56968855282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+retrieve+email+password+from+android+phonePDF 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_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 17832 bytes
SHA-256: bedbda733853ba87f63d6420fa42843b0ea53168aefe801f13d0df0162510940
font_02_sfnt_off000134ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AD 10904 bytes
SHA-256: df4a01ab4da1317cf520e9d84a20e561b537b30b77c8d54fdc7d40c2c9b395a8

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