Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9d4d818e7f44ab…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 23:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54930dd4f40b170d4e2da4ec84c01fa6 SHA-1: 44cf13d8fd1b06c4cdcb9da9dfc7c7bcb2d68cdb SHA-256: 7f9d4d818e7f44abf6d293cd75cf7435c62aa967dbcd8718a6bf8669d926c43e
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it's used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://fazendasaojudastadeu.net/fotosempresa/files/43704220417.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613852932ca6f---31285608336.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/397cidqolr1j49hiua4uiimec7/18506813471.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/dosidazidebota.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f19e943ff8bf733b01c15b37cda0baa3/kerutamalikurijita.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/gepivaxofomixalera.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/76588730352.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/30861405954.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/30789673982.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/xesafumupatuviterefep.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/22935240200.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/satawamow.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/pasitibejubovoxoralumim.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ilic0dln6do6bsc0v8b19p008h/21902948872.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090903373515060.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/92252854054.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/31048169900.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/37554553751.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/depimov.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/rupasexed.pdfIn PDF document text
    • http://strandedtattoo.net/file/mivuvomutevajitoxoxu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/94921431368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fake+credit+card+generator+for+free+trialsPDF 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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 17192 bytes
SHA-256: 997c0492cc9cf7edc444361dbbfac0b90cca99165ba914642fa565b73fc3a608
font_01_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 10720 bytes
SHA-256: 9d77229812ecc0a83fa5225a429e5eb20d6310426d36f8ccf02cdede484f98f7
font_02_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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