Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d436ca5592be4f…

MALICIOUS

PDF

106.5 KB Created: 2021-09-01 06:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8b688047a56543afa53de7172b61b9b SHA-1: 7c2c4f5707d23ee57bf1ccaa70bb2850ad2783b5 SHA-256: 19d436ca5592be4f95009bb9e6623c8d1918debd21bb57800c05b29e88322866
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://amctop.com/board_data/editor_img/file/202106192015.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf89922214---12080428156.pdfIn PDF document text
    • http://amdind.com/userfiles/file/wugur.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/xovematuvemadoxiwetebeb.pdfIn PDF document text
    • http://cymagun.com/userfiles/tonusenolila.pdfIn PDF document text
    • http://santeh.md/img/files/1145630125.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/natitexag.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/zutatovemizigete.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/jubiwezufor.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b944a114ba---godureta.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/78247063410.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/genebasojefumilexofil.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///55777276371.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/vufawa.pdfIn PDF document text
    • http://espressoperfetto.nl/app/webroot/files/userfiles/files/goxusopokozedol.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/vojodakeladoberebimes.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/zalexijurolazosijefikoref.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5nbqjbccgvukpes7mrqfflnmg1/zutopilevasa.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16080dc83b598b---polopawewelebof.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f6bee45b30ecbae2e479c111c963cacd/77905992382.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a094a6230---44953580772.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c166992e4aa---88466287691.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c31a2a65d57---30769431379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=research+paper+in+imrad+formatPDF 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_off00013826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13826 19200 bytes
SHA-256: 334d6266fe6266c275b1c81d969991a9c1127a80a7a6e2f122970168c97c3d4e
font_01_sfnt_off000169fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18215 10884 bytes
SHA-256: 2c7dfd1917dc5ff102490a4721f00e5c9f9363e58edd7e63b528f660511a16d5

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