Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cfbe5d77a38253…

MALICIOUS

PDF

72.3 KB Created: 2021-10-02 10:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e581c27f636b2d2b2408ffde6f5b0f7 SHA-1: e61334c0d9dedf7f3594a41a51461a99e9d9882c SHA-256: e7cfbe5d77a382530c99895709fc1e0287165ef92becb277bf4c70d943b664ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are structured as a link farm to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://foto-klub.dk/userfiles/file/xogexibubatogimibewaxak.pdf In PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/32126037079.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/69974158727.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/49381175837.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/kelofuvifitotilefolu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146dc58ad398---66873626729.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/70887905121.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/redififidonifegememize.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/fitogoxaregedemimut.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/5512384349.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614226a5082e6---fimixuriso.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161404af3ee6d7---bidejifejorerunoguxulud.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/56070909072.pdfIn PDF document text
    • https://kawanmto.info/contents/files/37392990158.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/xusugukupenuxiluwap.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/mamulunuposuselaluguzur.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16157e3a533d2d---nuwegakomaf.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/rogadusazon.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/xixidolinoxex.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/68978370198.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16151d09b0d1d2---83776551250.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/zilijebopuzuvivanedotenij.pdfIn PDF document text
    • http://tyextractor.com/d/files/1991217838.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mto29ehnj5j3idhluqi2erk1m4/36458140915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pickled+corn+on+the+cobPDF 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_off0000b5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 18380 bytes
SHA-256: 9dadfb2cb2b4e94aada2ce06d8a6179d15a22025b7218b2b5d24f33348204874
font_02_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 10368 bytes
SHA-256: 7199acbad136b0ed27c543671e406c2bce44b1a1653b03aacd368d9d9a493a11

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