Malicious PDF — malware analysis report

Static analysis result for SHA-256 a274e6a42ac8a33c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 21:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae573fb2791aeb34961601a1cc746c23 SHA-1: 095114a0397659d392b1d10223ad42218f8724d2 SHA-256: a274e6a42ac8a33cc863144814fa4dca5bbefb00ab1fa3f0648dd8525c18c96e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://livre-art.com/ckfinder/userfiles/files/47525526448.pdf In PDF document text
    • http://murielbellhomes.com/userfiles/files/86707009829.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/76e116cd7d9bb33c58f5edc2ab8a3f8d/voxirebi.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jiwavikose.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/kozifi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/fd4b93bb9efac644b1c65ddfa41e58b4/15154890662.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac189e1ebf---xowakejobemafilidiw.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/62714685155.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/32270672729.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/68536119705.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/49814806145.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/46599737520.pdfIn PDF document text
    • http://talleresjpg.es/img/file/41539775709.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/malelogativawepimixobikal.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/8883692578.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/74759835284.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/2102566500.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/mulitat.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/ralixisegamod.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/41218572067.pdfIn PDF document text
    • http://feminella.ro/upload/fck/jikijibebev.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/63519915438.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/fekorelujofikikodawamego.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/68770628042.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/lepovasokazezeke.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ieb4o3vvieohqn2naebitgn3rl/7388339580.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/vubufujorapotovetazipawad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=animal+crossing+new+leaf+apk+free+downloadPDF 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_off0000c375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 11024 bytes
SHA-256: ca18b0a71ec80a819784b986e2e2d4a7b09e443d57e0265e0c5a60b30086105f
font_02_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 16616 bytes
SHA-256: 5aaf66cb44bdaf6885e356819058d21dafdef3b5687f92b09369dddb9713db2c

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