Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec485094a37810dd…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 07:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70f161c33c446da0cafa8dad8db97cc2 SHA-1: 150f772f0eef674b77c8de496a1216431007eff6 SHA-256: ec485094a37810dd3f305b73df97cbcce928c19a070661fe5aca86ee15b88d09
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The primary attack pattern appears to be directing users to malicious websites, likely for phishing or to download further malware, leveraging the embedded JavaScript to facilitate this redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://wastran.ru/uplcv?utm_term=bully+lite+v2+apk PDF link annotation
    • https://dp-silver.com/userfiles/file/bizujuseb.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/5130935942.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/vafala.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/69047519546.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/12626230317.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/625fa9b5b5a0836427b16a88e7a8ce6b/11772305137.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe409c221ac90eef5022e5af980e1f7b/86331235255.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/917253634.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161408c24a6b51---99312535142.pdfIn PDF document text
    • https://yodobashi-church.com/delividuwugazobularija.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/4907439915.pdfIn PDF document text
    • http://abnicum.ru/files/file/99510213919.pdfIn PDF document text
    • http://platcometals.com/images/file/suvamiliwuf.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/7714476796.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/3667097.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/67103538703.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/60948999420.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///89644742438.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/62769648984.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/luzuwanojut.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/mamatixiv.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/46365012744.pdfIn PDF document text
    • http://lgassociates.in/uploads/wirivifinelevedizaxix.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/66540186504.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_off0000af74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF74 10300 bytes
SHA-256: 1f2be9442fee64c0d52dc1ffc3b83d52a289cc99be6b4ea59d5e9137d4fa1c3c
font_01_sfnt_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 16692 bytes
SHA-256: 3abd89e207bae76f5ff0b303c3dc7f0296dd5b490c710df8696d5550fa174934

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