Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2323a4974c0a0f4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 12:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 390375e3008867a81412e34240a3d04e SHA-1: bbe757962388d9e399bdb3df2644629e50a19bb5 SHA-256: b2323a4974c0a0f4f230602c1ba9c76198078827ecf9f5ba80e4262d6cff839e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/25053765025.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lqgiddhr239pitia5teieuef4/rabuxovebimajek.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/85431131870.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/fusulararivupebas.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/tojofimiselovopet.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/577486845.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/nojujudesadamikobedowe.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/metorinufu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/8dkmplbjfv4bcgrtr83r83d2bd/movekenelekuwozezo.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/16675673505.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/weroxumorozutumemojidobi.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/nadol.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/rakofemepesowa.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/62279143044.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/nunedumalipolufanevi.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/satanemofudorizozurow.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/16590832542.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/49150078769.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/86459343767.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/sixuzerowiragijubefiramab.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304f0301ac1---risekor.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/3996338050.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/23662064169.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a642f922ea---maxuvamotatatuwuruwekapa.pdfIn PDF document text
    • http://it-hair.com/userfiles/76053016846.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381efea2fb8---jadubisumafinapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=photo+editor+for+pc+windows+7PDF 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_off0000d91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 17496 bytes
SHA-256: 5b77ae1e3b3b912427cf4ca4c8d786f6ee016e56b23cea2452f22dff1ded98f9
font_01_sfnt_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 10644 bytes
SHA-256: bfd19b2242f702138eece3b467123067fed264e3b276b3a922fd0a0a675f1d3a
font_02_sfnt_off00011e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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