Malicious PDF — malware analysis report

Static analysis result for SHA-256 4479ea542f061934…

MALICIOUS

PDF

70.6 KB Created: 2021-09-03 19:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a883217c615203d18af9457fd415dce0 SHA-1: b3c7af40640addc9c605550ce2333caf4f3db3c4 SHA-256: 4479ea542f06193401266fea257245bfde47fac8aca508c45a30c2a6c367ae87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://deltagroup.bg/uploads/file/61886834664.pdf In PDF document text
    • http://abwva.com/uploads/files/78631676323.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b094571ebc1---48176100320.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e944b2204a6---gapibimil.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/jemazotilometid.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/jelos.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210819213710303.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/fozakidevawonelud.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/dimokatotusix.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/botaroxoponokex.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/60137069327.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6da45a11c4f78e28c141ea7a1c964315/42192174132.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/08f2de99cd5786c1e634b1e42fa4b3f6/modopejikirizedomagegiz.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/93304520891.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/97401249776.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/kukekuzefawik.pdfIn PDF document text
    • https://promise-land.com/upload/file/xenuzakelukekozobemupir.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/27vndb4ifugpmhuiuqc2kokko6/susonukunimofumevoboni.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d57c60d7---dinesaxorisakilatixog.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/98669607158.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/17806036259.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/42463577549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tabla+de+distribucion+normal+tipificada+pdfPDF 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_off0000b57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 10984 bytes
SHA-256: 8a402d5ddc456426924e990812c1a095ff08aee8dd328fd6a3228b91821ca63f
font_02_sfnt_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 15092 bytes
SHA-256: d68be69bc9d87b1e3b41d4243d0231e7f28a42eb4ba0e91eddb0d4b9c6a36c45

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