Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e87030ecda76cec…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 19:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 538d9b38c645e7fa0758fc9ebd3d7b85 SHA-1: d85b34715e5d6b4ebe63ec2751b17a8b38f4a540 SHA-256: 3e87030ecda76cec4bc104658b9ad89f8099458795bdae4906c62c0709c4d164
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a18049babf0---rusojazewezafus.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a548d312d57---8889760304.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a14831edc26---biborexive.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2e51b3a8e4139344f87a3a39bffb750/19472623228.pdf
    • https://carolinevlieghe.fr/images/file/lobokate.pdf
    • http://singlesync.com/userfiles/file/kevukokimoxusiguxoxevoz.pdf
    • http://allasclub.com/campannas/file/kofojimozutojegatugajaged.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/91a4ab067ace2f5ba6222146a52be39c/bijasizofovalonufofenowul.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b619e7964---64021401244.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/4e7ac5bbdd12088604fbad2dd5b05fa4/63252397446.pdf
    • http://flirdining.com/uploads/files/82709480489.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf4cec665---kilogutanoburisopodik.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bc1ef42f07---budeladerav.pdf
    • https://kaptenhoki.com/contents/files/nitoximux.pdf
    • http://kronikarp.pl/ckfinder/userfiles/files/60768889584.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qgituciirr66p8i8qqfu7osno0/gukuwurilowaledimu.pdf
    • http://wowbond.com/upload/Fckeditor/file/pojagowosakabara.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bca0ed9e4e5---59668841500.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3e3a6c511ad55a67237b29e403210560/vasuzef.pdf
    • http://cdhsalumni.com/clients/28864/File/xixifigi.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7232997b1---xeziz.pdf
    • https://facade-metal.ch/ckfinder/userfiles/files/42975473298.pdf
    • http://mispuntossaga.com/campannas/file/61519694371.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zinepez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sejarah+kerajaan+ternate+dan+tidore+pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9d829b2c80abc3666191314c3051b271/galofejit.pdf
    • 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://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000f035.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 16792 bytes
font_01_sfnt_off0001084c.bin
8918d91bd24a80212a19dfeff6ecfb0a208d199accdd6363ca530045c1620cdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 10680 bytes
font_02_sfnt_off000120b9.bin
647f22ef428ff7cf4a1a74be5a0c29cf34a53aec5cb69477965394a2cefff5fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 16532 bytes