Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbe8cb0a7242d14…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 02:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4236da41fc976b2c881e942bac988a44 SHA-1: 2dddee0d883b83ce7194a6e3da6f2d60b7b3c49b SHA-256: 3dbe8cb0a7242d147c016a6b0f3350e4bfa41865f846e3d0cfa935b561697a6b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=instrumental+analysis+pdf+download PDF link annotation
    • http://www.anaja-inter.org/public/file/56217485748.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/325905bd2939b5e0d4dd20d27fecd551/27643646667.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nlluip77e40ddcnpg0b8nooe30/tanamotanasixiva.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/85611f375c4f3ad5605cad7a9b5066bc/daxepumus.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/pekowuxawez.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b13bda58a---50232427477.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///95781992503.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/giwujef.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/61659938120.pdfIn PDF document text
    • http://artospace.com/pics/file/55619906484.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/32834388818.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c52a95d83ef---jijowilovefi.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/17088901410.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/dafaragudokewok.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd95a2163d---74889377157.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/jetakijobazu.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/tufap.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c3559d90---berinokom.pdfIn PDF document text
    • http://0930actress.com/files/files/vobopiwuf.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/tuvazumuguladid.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e816e7c7098---89336995100.pdfIn PDF document text
    • http://rafaelokazakov.com/file/dokexum.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a57392496e---wemujatotepafimowiro.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc9cd45a0f---bupetunigidetuj.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e345b396004---fezuvoroba.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/79717861830.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_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 17532 bytes
SHA-256: 9d842b237dd48ad4cfebf435f6bbc66cfca2ebf4c965effba76c9bdb7f2161db
font_01_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA5 10908 bytes
SHA-256: 5a097664818311f85ffe25e017f08f68d063bc19649190f9ab1f202bf9441e54

Open this report in the interactive analyzer, or submit your own file for analysis.