Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5b3593963fdb7a…

MALICIOUS

PDF

87.2 KB Created: 2021-08-01 14:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9e346b01e3936c6ed45363f457faf0e2 SHA-1: 6d8587ab0e45e072b98c8b2db697e4cc1c3d71dc SHA-256: 5a5b3593963fdb7a5cd225515bc21b9c96fc99cbccf05ecc1df216edd91fb1a3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code within the user's browser or the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab137e8d512---lunen.pdf PDF link annotation
    • https://aiaciran.org/cache/fck_files/file/wenivebejoted.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/15811517697.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/efdfea11f457d5ed444a85898b11dd2b/20259313673.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/wadoxobevagago.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/gurobiliperevodedidibol.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/zofakonowotaj.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/21ab4fee231fac0647d3ee25516da6f2/60098914488.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/dc19d175cc6566d7f12441c7da928d6e/xonap.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/90069930724.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/44c9577c5dc36bbe83bcc85e7e46147f/bivolubogasejow.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a51209a51439aead9528232137ab5c4/22285401739.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef69b5fb3e---64351005506.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e132d577691---wanogaguriwifadeg.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/h8gvinocaq0muo253kfu22bfbi/23462172181.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/49551796697.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/ponokowinepofarof.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/92604847713.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081925d06cff---gawenubuzikesarosogu.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/87171302766.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/navamulofetakudu.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/76062693755.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///kogefokisutokowumorax.pdfIn PDF document text
    • http://herve-coiffure.ci/files/72691753727.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607027af461b1---fefibebebuvafezer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=eclinicalworks+training+manual+2020+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_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 16532 bytes
SHA-256: 998aee6996ca754d9d528205d3deebb06de73dcd3ef746fa3da864c1557c1f2b
font_01_sfnt_off00011acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E4 11336 bytes
SHA-256: 8ce27bba9d797fa4a250ce66aa01f684059f39edd59fb7cc7aa46bb24ca8a865

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