Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e905ad22541c28…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 02:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 455f3547b1a73892a061bfaffa976ead SHA-1: b097d2a03665e4de45327ab811489db205da0170 SHA-256: 38e905ad22541c285c9d52486f69afc62f11861c83a43d02bcdc4c40f83110cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to potentially compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d0ae6851---dogijewadu.pdf In PDF document text
    • http://mobydick-band.de/fckdata/file/9125154661.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161323a8b6165d---81067504038.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/jobivuninuzimujo.pdfIn PDF document text
    • http://med-os.com/user_upload/file/kapuvefumogimizale.pdfIn PDF document text
    • http://sinoorchids.com/image/file/vitel.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/23877015504.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/kuwikibi.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/sasoxiwowodevopefatiraba.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/mamugetotalimemaxujabop.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090212471999.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/lasudevoponipebefapidaxem.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/sekon.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/jonunes.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/6227879392.pdfIn PDF document text
    • http://otczenacts.com/media/files/19027576675.pdfIn PDF document text
    • https://fobh.net/userfiles/files/bexidisunura.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/tuluvetud.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/gofojaxu.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/84654340895.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d627dbee---lozaxejekatufujat.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/pelezexixu.pdfIn PDF document text
    • http://teakdeck.pl/files/file/dobawukagi.pdfIn PDF document text
    • https://gdaniec.com/upload/files/lasazovovuvub.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/javiloxarat.pdfIn PDF document text
    • http://fteq.ru/files/file/fewexegukeboloronopi.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/xuxam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=print+from+kindle+appPDF 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_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 10584 bytes
SHA-256: dfb71bd47f26b0edb8e127c29c1349e9de9750d0d3e267470666b66b269338ab
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 17192 bytes
SHA-256: a4749184e234930ab47213fabc2d4c8e0fee238f2b087c415e01db016f6b418a
font_02_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1