Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb720fa198784a1…

MALICIOUS

PDF

71.1 KB Created: 2021-05-19 07:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4b3ff8a1145ea2561e512668550bc78 SHA-1: 973893b48fbd3cfe89fc0f3170ece6fef3ab6412 SHA-256: 2bb720fa198784a1858cc97d9152bd47fc01ba6959f48aeebc68fbe5c8cd28b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://agrilaui.com/userfiles/file/64690364153.pdf
    • http://axiomestates.com/userfiles/file/36060280370.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2570b2659---46744839243.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3c0dcbd4---zufujunizegi.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a7b14564---28465348992.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dacefe799c---68717403737.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8db30839e---xunokisupemil.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16080741acbd75---36981250396.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/4a2f0e2a9a5ef9db999fb096ee84f22b/potoruvoxivovod.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f2ab0a04---82667571070.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f7691cb8---12104539539.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb6769af83---jixefuxerizor.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/mtpejiasjmufh82rihtj78lr95/wobedesuzerurevon.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7662c17c58c224f743df7ed04ca2e349/23519931647.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dba24987fa42a5deca4f62373c0ba784/23260052772.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+become+a+medical+interpreter+in+canada
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddff.bin
1f1158e8eee4c488431262145b419a5d702aebb082c649f893215ab6917220b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 5232 bytes
font_01_sfnt_off0000efbb.bin
1ae8aedaf93a18a5d6d8033372390a41c9c4e1d8187b6add062ab5092a582556		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 10928 bytes

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