Malicious PDF — malware analysis report

Static analysis result for SHA-256 489bb6a8734bd578…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 08:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e223bb4fd8343b45f84a1b097346eec4 SHA-1: 7fc0ed681fb2a3684a3a5c009472e9be53c8e530 SHA-256: 489bb6a8734bd578d62fc7cf0106d28d36fa6065c2145c40ef855f6029d79114
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://venusnvs.com/userfiles/file/xojeguk.pdf In PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/aa6fc5fc54c56cdd772fbffeeb6a4e2b/jexuwitamezularux.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/36799535035.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/242f566ddc77699072dfeed1adb4178b/71416585395.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad93fa2332---lawozurapuzepot.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210901121240960257070.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160707d959721f---nogosubefuvesi.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/zazanelilobekugipibe.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/g6reull09b36fm3uhu7f3bouha/147320786.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/lekalaleteb.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/90043283376.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tukanejuwolabifonuvito.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/36320c4js6sqh31hdrf7mef629/35456396500.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfbf2d2a66---40251133259.pdfPDF link annotation
    • http://firanywiktoria.pl/uploads/editor/file/finekadusepe.pdfIn PDF document text
    • http://web300k.com/upload/ck/files/ritasivivi.pdfIn PDF document text
    • https://uudanbury.life/files/file/63625840844.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/sadilidud.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/rj0q7fu93epaetp5kok908ftbu/fegofokigofaposowulevi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d91c4b6b5c---72837054295.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fccde815e12---81802728318.pdfIn PDF document text
    • http://artospace.com/pics/file/miponenikanugifosejodute.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b5fb0cf99369262f967de31cf50e6509/8082844393.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/wififubenesadasu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/38031121571.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/360vm7e88b1ravt89gfugc68at/tanan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=population+related+questions+and+answersPDF 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_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 17936 bytes
SHA-256: 0543dfe0c493a281076ae83c1682654283d67ce003f3be1020d8bc9c1cb8be80
font_01_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 10716 bytes
SHA-256: 2d1c05be6939d037d67424e38c6dfba8c10c4594c1668bfcef364a9737764dfa
font_02_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1