Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a4fc55c7756c6e…

MALICIOUS

PDF

91.1 KB Created: 2021-07-30 20:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fecc3982bc68aa788676c01b1dbe7c65 SHA-1: f447ce1adfe62bf0d292ccdd7c83d8db400cd28c SHA-256: 57a4fc55c7756c6e7d0ac9c0c84e6a09223ef63a3afc604c10c42ca8a530e269
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting it's designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The file's structure and numerous external links align with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://dianacb.cz/userfiles/file/10035168868.pdf In PDF document text
    • http://superplasticizer.cn/d/files/jixuruxawoxomut.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/vobexenizofotus.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/zodaxowipo.pdfIn PDF document text
    • http://rentaruedas.com/files/others/71052773170.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/46105664509.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/pirovadadopumowe.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b893f567---keresebazoguxikezu.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/57941319958.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d001b63015f---kiger.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/burajuzusazofoxefavuwuve.pdfIn PDF document text
    • https://amblamy.ee/upload/file/61763921413.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/bebisegukuzatubibitifog.pdfIn PDF document text
    • http://huntland.hu/upload/file/47747481679.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/30545010277.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/vugor.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cdd8ea5b1---46830093612.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c5972b28---76467111437.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/1kn6do2vfto2e4qk3b5aaeqhkr/wekalukizi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868de55c1df---dugokumaxolotazo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160770b721e58e---52381836139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=new+hollywood+movies+download+in+hindi+dubbed+2021PDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/475b82ae8a1f5b685f5617d3c9ebf75d/fexubofesupakeforazaru.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_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 17268 bytes
SHA-256: 2622a1f61ce7e70347b86a18ba9d171e83b75832ee9e794366dc4c2b57f61441
font_01_sfnt_off00012c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 11092 bytes
SHA-256: bc198495a640448787cdd85c2e329d000b41dcce0b278606db9e96193b7cbeb3
font_02_sfnt_off000145e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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