Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d91b8f860b3b29…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 23:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e51e1ec1ce412c6b547416ca1fb89c55 SHA-1: d849154d62372613cae2d80b4c5e47f845718897 SHA-256: 29d91b8f860b3b293a16d7f71241b21c3768d230dabd4ea9ac19078d7fcbca98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct, low-reputation hosts, suggesting an attempt to distribute malicious content or conduct phishing. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://zemiigori.com/uploads/file/67916816699.pdf In PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/nadunixaxikixu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613761336ee70---971907462.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/ranad.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/11205468797.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/45282663860.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/jisesadesukidigawuzuru.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/7350778351.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/93262937694.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/dakafifasifetalobowidimez.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/tawuzadu.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/nerasexemogu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476c0f9c61c---nivimagibab.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/maxinebokot.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/ratit.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vikolukasoxuwaduw.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/woxuneganowanejobomoziwu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/467d6d4eb1b1de615c5f3c380479a844/1858904281.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/lazakurafoka.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/supazenozufeloranovo.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/12359747737.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/91517459871.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/nifuse.pdfIn PDF document text
    • http://chipgene.com/image/files/20210905_024725.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/74264898447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=move+apps+between+android+phonesPDF 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_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 17308 bytes
SHA-256: c96313f070aad65576844d60697e1964df60b084b9b913326c7e2b03ff58fd2e
font_01_sfnt_off000115db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 10728 bytes
SHA-256: 2e3ea157927e7a6471042b3e67ad1cf729b44ab50af2ef1ce1c23d1e1215c1b2
font_02_sfnt_off00012e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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