Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed7e04527803364…

MALICIOUS

PDF

86.7 KB Created: 2021-09-16 00:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4937f6cf0ddff4642e45863333fa6b6d SHA-1: 41430a6c4799cdbb6e4555fb10f20c1eb2c2ca70 SHA-256: 2ed7e04527803364f8b302ea8055e519fe2f532863fe179797c8e86a0bf23847
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URI and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://inwebjor.ru/uplcv?utm_term=how+to+deny+apps+internet+access+android PDF link annotation
    • https://jogamiskolc.hu/ckfinder/userfiles/files/53669056413.pdfIn PDF document text
    • http://adriennemason.com/assets/files/39518723483.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/gubomugeligabenuj.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/ronireverawafawoj.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/pafuturavapezorir.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c0738e4d0dbad99f48a3efde11bcc977/wawavizet.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/fajivutugeb.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/85093890140.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/sinekikidira.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/86294672872.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/vesotanoxobusino.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324c75181d8---90049883217.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/xilenu.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/30531358839.pdfIn PDF document text
    • http://yilip.net/userData/board/file/xibufaliw.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/wukufovusak.pdfIn PDF document text
    • https://fuoriscena.eu/file/jezijigak.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/58958573344.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/22600592650.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/36693284553.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/25936230098.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/381pubtv4pa367sp90peuldhc0/wemejalefujebirovad.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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 18944 bytes
SHA-256: c6146213f29497a6d33ecc717e7043bcdd14778a4d7fedd45df819ea68844906
font_01_sfnt_off00011cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C4 10652 bytes
SHA-256: d95d2abd75ea74f6434f56997ace8705a70e9adbd036be3e373002975b70e65c