Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83ccd5251fa8ed7…

MALICIOUS

PDF

77.7 KB Created: 2021-09-22 21:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ca60f461b80b7cf3cb5cd09252c4b29 SHA-1: a5742a82c50cf85c68e1306dc8d75a9adba782a6 SHA-256: d83ccd5251fa8ed727f2da9a3e21c699d49c5c28161f51d0c20bb5346b92350c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=the+king%27s+avatar+episode+7+english+sub PDF link annotation
    • http://nhuaduongnhapkhauaz.org/upload/files/lutodaj.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/72901705361.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/61992110805.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/lokalefivuvawivebaw.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/bojideleja.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/19374043027.pdfIn PDF document text
    • http://www.andreapondika.cz/file/70941105190.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314ada8161d---54160471530.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/tijexibebetepenu.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/65949269092.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140127c50254---71467030468.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/guxovewogomozesekuvo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/njmmbked4om2gbj06tc40viqo0/wapagezimiminewotus.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/97427085100.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/9296291107.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/29626574463.pdfIn PDF document text
    • http://elpijisystem.com/file/12143861546.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210909045146_g745yv.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/ragumosewesem.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/dewupodokiw.pdfIn PDF document text
    • http://underbutter.cz/download/foto/64063138314.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/3551486769.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_off0000c94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94B 11116 bytes
SHA-256: e3b2bd2372e86ce91af06bb47ca6df49e7c2dac218847c5f71b2dcb68444cc46
font_01_sfnt_off0000e2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 17972 bytes
SHA-256: 90d19a7471796618a73cd7b9b70aa3fa8b4c06f9fc55b991d97cbac1b8a07468
font_02_sfnt_off00011123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1