Malicious PDF — malware analysis report

Static analysis result for SHA-256 811b26d9c89e3db1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 03:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fed0c02296ad74f3306f786983c64ddc SHA-1: 79bdb4a3dfc47518b06da2e0c3578fdf3278abe2 SHA-256: 811b26d9c89e3db1343a94f4c3d08c73b477dd2c74bbd2cd0d685f88fa78324e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URIs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=mexican+mafia+book+pdf PDF link annotation
    • http://andreaslasnik.com/data/files/mubogeweku.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609acda76faff---65410583183.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/676185953311513dd658c67735cad005/sujoluzugakijitonu.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/ziwepebilowulawixajexoze.pdfPDF link annotation
    • http://freetourscadiz.com//ckfinder/userfiles/files/13407184428.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/58333598119.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3f5d6ddf---dizefulexebapil.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/ralunebev.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/dibabilixe.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/fodulonu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609437af07770---rekojis.pdfIn PDF document text
    • https://motoralbini.it/files/file/tiniledufufegejofef.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/sozabaro.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99dfc1301---logazimevogopewalu.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/61792602683.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/52637603077.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/52731838241.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/46097274908.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c332c403bed---81018612763.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094881097296---nakegisosajanofepuzawolo.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/vr178sb14eu09bkhc3du06bic5/508183222.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/80d653975ed7ab3ac8e10c2315730ad3/jumuk.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/numizefekenukigava.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8267c5017c---fidejuruvozatiwovefupof.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/23436069517.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/muzolipejasumomu.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_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 17884 bytes
SHA-256: 67a442b8858c1ac273145b0f477f3346e7d20efd6cc425606c584bd2cb2e8312
font_02_sfnt_off0001212f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212F 10696 bytes
SHA-256: 370958cb4ef36cc57a9649aa245e32d1573789da0c9727553a0b6878312d6c6a

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