Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7c6c7910eee9ed…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 04:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f63ba2a9eefb9ca030acdf412da18216 SHA-1: 3b7fca17f35800479ffde83b7379a92ea9886c42 SHA-256: 1f7c6c7910eee9ed55dc94a90cbd0c4406ce148968034db7bbb5a5378b68ac90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 http://sloplast.com/userfiles/files/buwumus.pdf In PDF document text
    • http://happinessgown.com/upload/users/files/lifagasibaveketa.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/91646150072.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/53292130902.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/fewujesuxanik.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/27301315374.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a80e682baea4af3bce09f9316ae7949a/94161164484.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/rojapumodixezujinulofasod.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/8128343081.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/258659720.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/30156165911.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/gokopidowubupupunokuzo.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/rivukar.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/21661830150.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/pawimakizomab.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e6a821ea---63238840345.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/witoborolu.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/zesilizezolaw.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/44848379440.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/nimewisamawapofasavedexaw.pdfIn PDF document text
    • https://ms02bet.com/contents/files/76348421475.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/rikobomupesu.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/jonuketogilaju.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/8e46882b6175e5cc420026b92fef7d28/21943842925.pdfIn PDF document text
    • https://aayams.com/userfiles/file/feparexurolezog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=www+cyanogenmod+com+devicesPDF 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_off0000c942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC942 17524 bytes
SHA-256: f5c695960bf103d3f0f8b5372a28b53be7281fde56492fc3181b7882f649edae
font_01_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 10728 bytes
SHA-256: dc244d913585e1913a2dc8d2f44b6be485ecd646944a834f4d4568fc39384839
font_02_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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