Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8f4fcb01fb9a47…

MALICIOUS

PDF

112.2 KB Created: 2021-09-20 20:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb478218029dce97799d91d5ce67e808 SHA-1: 7526c16b66c7c7e138fa46c52360c1977cfdf249 SHA-256: 0c8f4fcb01fb9a4721fa9008f89a8f79233148a349f7a1ae3ad84012a7cc477c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple external URLs, many hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vesimport.ru/userfiles/file/4052897651.pdf
    • http://krakow4you.pl/krakow/files/51350780282.pdf
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/jamiparitirobeduxogu.pdf
    • http://druckmaschinenservice.com/uploads/fce/files/manijanakibujofana.pdf
    • https://msiutilities.net/documents/luruf.pdf
    • https://beautyyaurient.com/editor_upload/file/gegazajuk.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/29425680513.pdf
    • http://ellissi.org/userfiles/files/vatelemasin.pdf
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/48066084900.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613573fb887bf---zadagorusowulexomub.pdf
    • https://shidoremicrosys.com/media/79848806585.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161482c510e634---maxunutazupidarev.pdf
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/73568739789.pdf
    • https://ever-progress.dacola.com/upload/files/birusutupidezil.pdf
    • http://gtlfuelmarine.com/userfiles/file/zotesuxevujeze.pdf
    • https://chptravel.ir/data/file/wifegamulopofu.pdf
    • http://escuelasfutbol8.com/docs/files/rurutixemibirufowos.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/vedagug.pdf
    • http://moonlightmontessori.com/upload/files/dugunig.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/72051953589.pdf
    • http://nhungbaithuocnam.com/img-tvdl/files/nikaxetenujavusugorozizal.pdf
    • http://barahi.com/assets/userfiles/files/tituwenafiwoxalerov.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e9c85271e---vinoxekonev.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/sebiti.pdf
    • http://bjsixiang.com/jingkelun/userfiles/files/20210903224437.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/99093118554.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+free+fire+obb+data
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4B 16792 bytes
font_01_sfnt_off00016562.bin
e1f5bb5721f406ac5acb052ef91fe90a8f6ce8fbe63311f30e167828bf0c66f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x16562 10404 bytes
font_02_sfnt_off00017d0e.bin
a207fa614df402308f225257dab04d77863f276148394acf70c53bd4df554dc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x17D0E 20616 bytes