Malicious PDF — malware analysis report

Static analysis result for SHA-256 597df4eaa2c94193…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 11:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41452eca9756bb8302d3c643a674846e SHA-1: 3b67bd5b280910e7675407f818e6664bc01115c7 SHA-256: 597df4eaa2c94193197e24dbadbfd828f579b4a5c02f2296dcca7e0542de41c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites acting as a link farm. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a tactic to distribute malicious links disguised as downloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=minecraft+download+gratis PDF link annotation
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4cb668678---fazibilinatavu.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133992fb702d---95370755214.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/gifuxobasamizizupejebom.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/86605901675.pdfIn PDF document text
    • http://lamay.de/userfiles/file/repiragapajivuzunabife.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/jufasolukotivo.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///40675199390.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/xurewakotutufobupi.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/fomuverapatapejabatufopo.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/beputabavufejo.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/59456266925.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202192367215684.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/bavibosuxowotakuz.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/gikuj.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/4146889559.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/gupisafuvulerag.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109180647532518.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/93955307941.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/kodal.pdfIn PDF document text
    • https://aokman-drive.com/d/files/fenin.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/mojoworediwubag.pdfIn PDF document text
    • https://ip-pharma.net/data/files/josawavarusiduj.pdfIn PDF document text
    • http://olympusflights.com/files/files/10465086207.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161452a10d91ae---zeloxatip.pdfIn PDF document text
    • 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_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 17712 bytes
SHA-256: 1045ba27f02e58f2b474ea5d708bb5901826fd1b0ae252c066274009f91f9731
font_02_sfnt_off00011751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 10728 bytes
SHA-256: 4a95d0017828972366203ce69509488736934f40e4b60a9e3538175ce1d12b49

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