Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5e98d93a0eb7c3…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 01:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33bd89ec072ead8e9d049ae973ff87b1 SHA-1: f043a28bd437bdc1c86becddf96a833c4f106b81 SHA-256: ce5e98d93a0eb7c308311e7eb0ce0360df9e2a6283c57456f281735274f96d2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious actions within documents. It also features a link farm pointing to multiple distinct hosts, including one identified as a compromised WordPress upload, suggesting an attempt to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://archism.ru/uplcv?utm_term=what+is+api+for+android PDF link annotation
    • http://telek-trans.hu/editor_up/33909806131.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210903/file/koduwise.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139edf19fd2b---85782470310.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/situteligutewuwabodipovu.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/wakeferabinuj.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/77662002491.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/99074487993.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/63689396029.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/13644157971.pdfIn PDF document text
    • https://bak.vn/upload/files/jujidilo.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/93157427829.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/savetisonujalivowiwonu.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/tebifomatavabofifopuwon.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a0b092b34e87be8378d94e46ef85cc5c/malivole.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/7059060526.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/8125649012.pdfIn PDF document text
    • https://gdaniec.com/upload/files/sirorizufapixar.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/gunesudasakujixaruget.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pewikuzutej.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/zubevavaza.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/fukeguxabujugenunu.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/81807247504.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/53810665848.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/fitogoxaregedemimut.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/fijur.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///xopisowamorobulo.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/tukodomobiz.pdfIn PDF document text
    • 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_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 17264 bytes
SHA-256: cadef7295d8b53d04b3c0384a70b49103d23cfbfcd2222c21f0ed40ed6a972b6
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 10412 bytes
SHA-256: a69cf2fbe1e18f13e40ee5d428a96e96b730834580d1f05774cd7a82efb23b96

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