Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0ccd6b708e337d…

MALICIOUS

PDF

99.9 KB Created: 2021-09-06 13:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b733d5bd16f4df615a8016b47e5c8bb SHA-1: 6334560bdbde3289796c0b04b4d2fe45491631a1 SHA-256: 6e0ccd6b708e337d8d2c609af058f7a5afce7b1c4489943af4fa4277b2886de9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure victims to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119968bd36dd---49757775416.pdf In PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rmd5893d139pmiq5crv35viv60/zeser.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/fuziduxogud.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/1096008743.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/kifevebugawe.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c4eb1fc60ac58fdebe7ec71df88e4eaa/kewegaxumigi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27030c821---worazowekudadubu.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/dulekakudadamupuzarixe.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/86330645377.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/c9pktp1lm6aoqtgkmn67r7da13/92394947401.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/bubimivamebefux.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/51560621989.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608544ffe8072---xosusosikarof.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/zanuvov.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9237f189ff---sezer.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/m2om236ckp2j60op4boo28i391/28619600688.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/365f1d2f80531324e432eae255528c34/19386902247.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6e6a69af66b9a769e53e6a92a9a13ffb/vapuserewifivi.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zudaxogi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25c710f904---4482861777.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160763d0a4213b---vuzelemawidofoji.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161191ba1aca1e---1756097375.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/potamukitudazusukumerukov.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c650a06207b---xizoso.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/01e0dc02ba14e6502acca21bf8d7d5cd/tewulazepexufekugosegos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=merge+pdf+files+adobe+reader+xiPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 10708 bytes
SHA-256: cb8110ab44a70eafbc08cba36653ff5b37a476136f4a4a697f50ddbf7eed57e9
font_02_sfnt_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 16972 bytes
SHA-256: a757fccc5232470951f125da94063b3e4ff3b5368a0402cb82122f1319bda706
font_03_sfnt_off000136ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AE 26128 bytes
SHA-256: 232e95ad7cb213a4c9da42e3cb6ccb57e1124693a345694395a93564273c2dba
font_04_sfnt_off00017785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17785 2084 bytes
SHA-256: aa114bc8d3621748bb71f7e8dcf52de4cda7ed7e64c3e34fb0e22c731782ada4

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