Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ffb8cb263f3427…

MALICIOUS

PDF

71.5 KB Created: 2021-09-02 04:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 836accbeb62e230ded79c870fab06c3b SHA-1: 8493673c009e5fc637558719b2b40054b4ed0975 SHA-256: 12ffb8cb263f342732ebc94edd9f9719d6ecf9d65c8345759d073552ce1619c9
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f14cbbda6---goxigezanedigijefigow.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/34811313289.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/merapi.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/revasixasubij.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0eb15c0ddde547ab02494a219c53751/65813757871.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d96377e3aa---23864176507.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/14587019420.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/62145203033.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/tegobozujiwumiwezizowunud.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/05552d5c2a0b55e410b57c6e1420fb08/43633972692.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/873ad522c80f06cce66801608e5c007d/62725837685.pdfIn PDF document text
    • http://climtech.com/files/files/vobonopo.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/l1vrrole8m5ugco5a1jp1q7dmc/53900676336.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/dazuruno.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/98999862159.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/10/file/meniguwul.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/tujogakuwirunuvobivarizum.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd369066897---fulusilimitoros.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087812c08952---gubitamomo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094c39030054---tonoteg.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/nekonoganokokevobobemuk.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/704fe8eb546b04246233cb6f86965064/finadowarobivilibax.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/wizijitopikunulaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+take+360+picturesPDF 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_off0000b9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 10948 bytes
SHA-256: e3a772bcdccdc4caad2e4d36dcf5d4a590e8d1731354edace25feb22bdd578b9
font_02_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 14564 bytes
SHA-256: 0c5a3c48934c151743d48218d9fab706f036ff48573ed72cb8fa5249d8dc1e3d

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