Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd0ab4baf949e2e…

MALICIOUS

PDF

105.2 KB Created: 2021-07-18 16:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97f3d96065871b414b696c92799c5904 SHA-1: 0d8d056ee81cb438e14f416cb19a61d52d74f1d5 SHA-256: 8fd0ab4baf949e2ef2c767cf721d5df878dd203a26222bf9ea7b2528f1c72e36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to external sites hosted on compromised WordPress installations, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 6

  • 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.
  • 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://aymexco.eu/ckfinder/userfiles/files/4411093760.pdf
    • https://sportcity.bg/webroot/img/content/files/walegepikufixer.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/bns9pgetaobaqihpkakf925ikm/bonedowaben.pdf
    • https://cabsfromheathrow.com/userfiles/file/312134260.pdf
    • https://abyway.lv/images/ck_images/files/deripogibusa.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906582a227d---ragevaw.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a17a22e3a92b81b9a9cda4814f630195/53634638249.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a926386770adcf01f30fb8511d03a2e9/pazikutuso.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/97f60f213339fcee8f1801e1d9c04656/nefisamilerubunutagupin.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2336492b4d---sulobawusitapadi.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac252f2667---57382660985.pdf
    • http://amandatravel.com/userfiles/file/fidut.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f9a63e33b---54899971747.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/gbaqkbvk75260i2lr4d4h2hc11/95123907533.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/4cdc0c976d806019b565d48877773c16/1562426693.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2kfovv0b5crpc5oq702qq141ri/miregomidekeg.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2f8feb69d221648606523780d55d9f86/43224061057.pdf
    • http://kanstm.com/ckupload/files/xavuzusadixefewegefipe.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3ed62fd831f8b4e69968fee71a27a821/59654063380.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f72dc475e---juwilofoz.pdf
    • http://ellerbeefamilyreunion.com/clients/874543/File/nutijolupegabavigota.pdf
    • https://wegofa.com/userfiles/file/suxarokixegu.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c13fd97177f---70997125413.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3fd056f7---75725869434.pdf
    • https://snqrsl.quebec/upload/editor/file/rorakogulibuvapifibuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wow+classic+fishing+zones+by+level
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121c2.bin
2c48922626f9fa421cbbeefadd0fe45452542669d8a5dd51a684b0718e92ac51
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 17536 bytes
font_01_sfnt_off00014f84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F84 16792 bytes
font_02_sfnt_off00016795.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x16795 16312 bytes
font_03_sfnt_off00017da1.bin
f940d0949a7c05e4bbc7d65f43b416054a549cd3ddcdca5b642b5fc9bc2ed4d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA1 10876 bytes