Malicious PDF — malware analysis report

Static analysis result for SHA-256 4002081576b285db…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 19:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0297bfc8c8749415acf467469f82cfe SHA-1: e9913b470b5aa53a7c85882b972a03533ea70582 SHA-256: 4002081576b285db668f9e7074e4579a469b98468240f49561118bb9128a8c9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to potentially compromised websites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF, likely to redirect the user to external sites for further exploitation or phishing. The URLs extracted, such as http://daearesort.com/FileData/ckfinder/files/20210905_06F98BA1EB968CE9.pdf, are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://daearesort.com/FileData/ckfinder/files/20210905_06F98BA1EB968CE9.pdf
    • https://cortopolis.ar/userfiles/file/xenasigisadapepivusage.pdf
    • https://poganyvolgyi.hu/userfiles/file/samunel.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ebbb3685.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210911_5D0BCDD432E35DC9.pdf
    • http://panel2conso.com/userfiles/file/wifuwadupasenelo.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/532f4230be744a2dc30ad79300c3b2a1/24046789576.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/57162562441.pdf
    • https://webmenuplus.com/images/file/norogugakasalu.pdf
    • http://boldogelet.hu/media/31173097890.pdf
    • http://boldogelet.hu/media/mepexinokuwavabofat.pdf
    • http://yangpupark.com/uploadfile/files/45794187872.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/5499003537.pdf
    • https://virker-ikke.dk/files/4123028231.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613456665632b---62362377084.pdf
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/likutodaroranebasa.pdf
    • https://mbzl-pro.xyz/web/img/podborky/files/59708607996.pdf
    • https://vespaclubcagliari.com/userfiles/file/zobuxivapativoj.pdf
    • http://ilkconstruction.com/Images/Media/files/tipepibuda.pdf
    • http://billedbutikken.dk/articlefiles/file/xarigibifa.pdf
    • https://kurek-rowery.pl/user_pict/file/9663446884.pdf
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/nujidox.pdf
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/fusajukuda.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ea+sports+android+game+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e7.bin
e17a01652326b8f615e6e8bc31fd0f9455c681fd77e12eea4695bcd5af89c045
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 17384 bytes
font_01_sfnt_off0001162a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1162A 16792 bytes
font_02_sfnt_off00012e41.bin
fe7ded3e16d14c43c6e6dd757ad39cd8c042006d360b1e751cc4da3ebd812c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E41 10804 bytes