Malicious PDF — malware analysis report

Static analysis result for SHA-256 3442e933b4e4dc36…

MALICIOUS

PDF

89.8 KB Created: 2021-09-06 01:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed5afc5430f1a62e0402f472005b56f3 SHA-1: bacc38ec6232e56dd43947aac469b6f92e69c9a3 SHA-256: 3442e933b4e4dc36619c9bd5ea8521963a43be6cb3b8a9cc377c21a8a8cda1a5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript points to T1059.007, and the nature of the links suggests a potential spearphishing attachment vector (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ejmk.com/ej/upload/files/221500799.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/arbjv385pkageqn1h30iie8p32/11921682375.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/fudaxivakelepusus.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/31166861630.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b279dc31a9---12756434002.pdfPDF link annotation
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d578ecd20a---birisawegapa.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8a672e5f93209cc3e5e63d3f5aad3360/vowifodurobomivufeke.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09be8d75c---42499303447.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/94084595677.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7c0771856042478e5c43468d09774642/lurefafajufoz.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1513b746fedae7146632c78311c8dbff/892939372.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/xejufetufinulej.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/momow.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/pukufifigasen.pdfIn PDF document text
    • http://evola.it/userfiles/files/11210280881.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161211d5f5d355---lamivurulenosal.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5k3v62hmqb4npmigadinkd7as7/53585832592.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/89649919739.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/wunelikenajemuzixoduzo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gnb9h35lijftm0d93vnqdd3d00/89681190869.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb0a99d486---56628838637.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9c23c88847006d3c70b30536c307e9e3/57538566940.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c32900f8---75476438473.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d274b98f04---52984062913.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/xalezenedisupuga.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b1415dd83dd9df1f7bc3f9c6991d4ec3/tedovujopososogida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=prova+de+proficiencia+em+ingles+com+gabarito+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_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 19776 bytes
SHA-256: ee99667dd8764d97c2568eca4675a62ec9cfd77be6ad90bd91d0bd8215fc2bd9
font_01_sfnt_off0001255f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D76 11172 bytes
SHA-256: dc61ce1eadfe0200f6c704431b869d50a43c401f257d66af4d7058eb04e9b6cf

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