Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03831ac2a4270ae…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 04:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0cd000b07e8286543487fb0a65789329 SHA-1: 1751cd0e8d1d666a85f354f8e0010915a3738469 SHA-256: c03831ac2a4270ae725e2083548e1f669eafc306f86edc8f454bb34885aaa27e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ppkh.net/userfiles/file/68872607717.pdf In PDF document text
    • http://progfin.pl/userfiles/file/34722565784.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614038c59e7ee---tapojojisiselukusogugo.pdfIn PDF document text
    • https://electroagro.es/pub/files/1883673604.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/929239454.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210904_C662D2AB40FF9616.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/jijotanutumumudogu.pdfIn PDF document text
    • http://kite-surf.sk/files/75654668281.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210922024256_x5trlf.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/xerigusurolabulusat.pdfIn PDF document text
    • http://vaynhe.com/upload/files/direjivekazomu.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/12053902740.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/kojezeda.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/37423870260.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/sizelijigugozi.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/xokibugazuxomebifuvasofif.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/90505064618.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/jeroporiwa.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/95642714004.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/12a09eec38b90d22df76e5888c2b71c7/rinovep.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/30d82f2034a27036682b49fea80e4e0e/deporowenifi.pdfIn PDF document text
    • http://ausafe.net/images/art/files/51618847042.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/90599163287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=font+manager+after+effects+crackPDF 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_off0000b0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B9 10608 bytes
SHA-256: edfe5165a399a97c9c2ab398d2f024b504b3a5324fd137af2f893e19a1b0ff81
font_02_sfnt_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 15668 bytes
SHA-256: 5df489a80c474127ad8edc05432aed139044cef1aa237759425958f988fb9625