Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cc8f9af5354c48…

MALICIOUS

PDF

80.5 KB Created: 2021-07-24 04:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c1385483ec81178fe874184320840a2 SHA-1: e045f4a981bcb00ac028e6b4312debc3dbf196ff SHA-256: 42cc8f9af5354c4888b4c43b4d25a66fe1fe909969f50c1a35f6830522dcbfb5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://china-zub.ru/userfiles/file/33042665909.pdf In PDF document text
    • http://mixmarketing.vn/upload/fck/file/negesiturovojerod.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/vsu64039gd8827ue31j88pnun6/takokerunuselifokefubute.pdfIn PDF document text
    • http://emeat.ru/var/files/zotajo.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/97ce157be19b0e73b56c97c630c20d4d/pomadelotimagexolirofotop.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced39e3675---17651627690.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/tobise.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210612_025716.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/63000566627.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/temevupezumekiborirawola.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/0f8d80d977bbdea89b141c9a520db4a8/jatepegizopekipesuxegu.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/xujojerixisig.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/g8plqr7b3mibgncoqhiad5fc9h/98302314051.pdfIn PDF document text
    • https://marigabung.com/contents//files/4039914172.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/25354651159.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4455c249df2e9027aa1457df69c6d9e5/vovufofozofeseboxudugivo.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f323022c328---ziwinuwekixupuwobovusakon.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dka3ql6vu0jgdsamtknmrecqib/85478668308.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/majiraruri.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/69019033093.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607caec2adc86---84592172466.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/bc958a44f2ac803699e3ef2d4b0dfc47/94653854567.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412cfa42cb---87182446766.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/gofojar.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/34743301082.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/miropisirenabiron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+ask+and+the+answer+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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 16960 bytes
SHA-256: e31a0605c298785960509ef04d4cbe9685864d9b3c0db95575d35fe6cdff9067
font_01_sfnt_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 10476 bytes
SHA-256: ff56de3ae8dc39fe139d6899b3a5a9fc2f1527dd75cf274601e00194d39810b7
font_02_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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