Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a611fd94beea19…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 01:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34f88c86bdde730350c47ac2223b12ae SHA-1: 5fa0078b7727eaa6bd4feae4bea1882b74b3d0ec SHA-256: 75a611fd94beea1924da3f91b0a2e4c1156e9539e7edd924d41db03dfe704001
104 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely serves to redirect the user to these malicious sites, potentially to download further payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160744925072b0---wegizemofirujosin.pdf In PDF document text
    • http://nattukoottam.com/userfiles/file/gomogogiwowemegefosikotol.pdfIn PDF document text
    • http://www.nomorcantikspesial.com/file/bebumilepabufunet.pdfIn PDF document text
    • http://lukinserv.hu/file/movuzinomogolikadujevo.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/jexutinezajavizo.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/33754983156.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2d47mc42aam4f3foa1e5imcec3/83545473497.pdfIn PDF document text
    • http://4bx.pl/public/file/84216193112.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/josetufisuzu.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/15464227541.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1128d85d7455a034f1542d60d44c0b96/nowomewuxawu.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/darejovuzidesem.pdfIn PDF document text
    • https://qnzar.com/files/xidasobuvakorenoborenave.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/55733867743.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/gi3dtr3v6neisf9djmshm1bfms/zesalazemav.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/4e41825257caf88f3a7d4a776158035e/moterimezawas.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/12655072829.pdfIn PDF document text
    • http://hasyo.net/files/file/64129494850.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/bb26qfq7nnfn4v6fvfo2fh7pj7/84779886664.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce81d47dd53---vemogodakesalefagorazune.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/wabegurenitede.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/tifumedesod.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/17752773050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=architectural+rendering+techniques+mike+w+lin+pdfPDF 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_off0000c0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BD 16788 bytes
SHA-256: f5d633e75e8e29795729b3746051d786b2fd0f600961c09676f38dee5984bea5
font_01_sfnt_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 11352 bytes
SHA-256: 6cc0a25043a71ce2e4b1ee5b57ee86f0e91925aa9d46e17da73a3f9f828aad89

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