Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4397ebcd8f9429…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 13:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b9d077a55c3b17802a169c704428220 SHA-1: 06f4d9c9779b5e17a1cb9991d8dc7b55b6736895 SHA-256: de4397ebcd8f9429aebcb8e6534a809761139ae75586bbfd9b54af5a4b75eed7
136 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/84204791590.pdf In PDF document text
    • http://sciattella.net/images/file/venozenozugikirifopulus.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/4265588932.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/nuvidutiporuwatexodagasa.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/sugozawepisezanajodil.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/dunitubakufukulivudafe.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jesudoxuxijobelofobu.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/65099579176.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/bawak.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/vilifajajat.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/bivamebobopoge.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/suruka.pdfIn PDF document text
    • https://suksesunited.com/contents//files/35125961962.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/mujibanedodel.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65f94a04d8---dezezivodotilirube.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ru78dtp4a4m91pdq6djc0mb4oo/94534263003.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/77838749661.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/40811422554.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/13677339557.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/metazadaxez.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9rirdh91j5uoi19cqond9ih3s6/46952292193.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d5631202---letekuvoxurenetogi.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/pagesaxomuzafe.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48e3c4fe1---29239872845.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/29698224442.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/99098543628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=social+reformers+of+kerala+pdfPDF 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_off0000cca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 10748 bytes
SHA-256: eb141092c91e44846c74445c8a9f7a7fa5c68b76bc1cb279210f80fdf567eba1
font_01_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 18860 bytes
SHA-256: 0cc926b5e642bfdab51ce2294090e4744deaa1c7d8a15963ca79dcce6bc5d269

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