Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a67660df3478bb2…

MALICIOUS

PDF

75.3 KB Created: 2021-09-24 10:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c0e7c9ca077b3e994709a1d9e31f1f8 SHA-1: ea13f96fc0c18f9dac63b14085cfcfa84f888663 SHA-256: 7a67660df3478bb26bc9cb6958f9ce92117259e1ba48df68934eab75ce72ad49
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://dwornawodzie.pl/userfiles/file/39715759352.pdf In PDF document text
    • https://nadrozmerne-sklo.cz/uploads/75659350947.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/38582829396.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/9955046824.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/40411735345.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/lutuxisamekuxixituwugu.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/62301353896.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/31594387598.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/boriwejunisefilamo.pdfIn PDF document text
    • https://jotelek.hu/files/file/fevutijutukoxipifirar.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/mojexuguparat.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/zudubupusaluzarikekuk.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/foxozapajitorebasunon.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/wogimorowexazisokuxu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e51f367f2---fajifugukedawizunore.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908101119.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/bujubere.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/732e37d2585be8b61a6fd04e0a686dad/fatomukelewir.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/25271537063.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/nivodepawurolowezu.pdfIn PDF document text
    • http://velisend.ru/photos/file/43535895805.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149fc7f5da1d---10368280196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=myfitnesspal+cracked+apkPDF 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_off0000c23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 17268 bytes
SHA-256: cc5d42bc0fa10f0296fcab08c11c2412979baeb756de16cb4cbf9ebefb8061fc
font_02_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 10692 bytes
SHA-256: 51d7d36cc258af656644c67953305198905e8e7ca9ac4488899e562b63988177

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