Malicious PDF — malware analysis report

Static analysis result for SHA-256 81386c2e9134455b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 05:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42e5e73d2d628034e6c06917addbf08e SHA-1: f30adcefc668bc6a32f64bf6e49486cc083b9187 SHA-256: 81386c2e9134455b71aa4e2af2332f12aa4dbdaf9e7dd1d38b4ae944f9634d2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to multiple domains, many of which are hosted on disposable or compromised infrastructure, suggesting an attempt to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://avenue102.com/uploads/file/52516040676.pdf In PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/75092439030.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93938d28a9---61961558207.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/25264218238.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/dolefubikoninalo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/kalasivalafasavojukigix.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/mowakogav.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lesokavorupirutusesovakap.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/14069694020.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6346ebbf6b4bb6d2cd69744b16dadb8c/97698325590.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/nazoduk.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/120baa0689166c527a046ab67ae7684c/dofunapikujo.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/mukiwu.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/31047483281.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/fcd1902e2b0e87ac29feb747c7d8e18b/jijatu.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/70619302261.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/zapezonebaxiriwevire.pdfIn PDF document text
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/92872506886.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/guxabesupuzamidiroli.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3ce13d36---topifivubim.pdfIn PDF document text
    • http://rentaruedas.com/files/others/jijobaxisakivajasu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/fce0873c234bbb8260b2ea1eceb0f0bd/59781990089.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e82a3debf---55762616523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=thermostat+valve+in+enginePDF 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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 16284 bytes
SHA-256: 39bf2258323de95fd592c1456858045be5416337f749c9c1af7af3cc7edf95ac
font_01_sfnt_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 10584 bytes
SHA-256: 27fa520f07a7c637ad942635db0b8bab5a1086d65d9af81aa7bbf2dc301e7f5d
font_02_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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