Malicious PDF — malware analysis report

Static analysis result for SHA-256 3feed2835c7b68fe…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 22:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5771fc427922792a601dff699f8370cc SHA-1: 17eb688c28bf5fa0855e328bac71d695729a2066 SHA-256: 3feed2835c7b68fe18ffb2b126c001ec75e736ba39da81ae03875e96fdaa3be1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://chcial.ru/uplcv?utm_term=rakita+rakita+song+download+mp3 PDF link annotation
    • http://ahkkpcm.org/userfiles/xinibuligimumezivumekixi.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/wuratilupepexi.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/56562561028.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/zuxavudepasodewudoxanisif.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/46506321955.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/89297446810.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210901/file/16304914342632.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/45675814770.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210908_76617CAAF1DE7F41.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/22463977.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210904_210704.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613831ddcfa97---texoramuropavenefemozewuv.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090523252597.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/92159792753.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/78852377135.pdfIn PDF document text
    • http://tzsunup.com/upload/wozotiwexipuxivepela.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021981228545562.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/96519784700.pdfIn PDF document text
    • http://minipit.com/data/files/vuremamumujagirefezexana.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210904_99D08DF306B8A8E1.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/64397900337.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa2b84830---61344372325.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/61933268875.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/65328602920.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/fanegevexigofulorakub.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/95266731127.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613130ef457a8---38972802574.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/10439008278.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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 11000 bytes
SHA-256: 668cf863d07df93789a71fc0854c76c2c3943956776c284ae121fbb4ea47f835
font_01_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 19824 bytes
SHA-256: 058b4606b8beb08bf380cfedfa0c9213ce9364731860adf2a89e7b8755cced6f
font_02_sfnt_off00012d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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